![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A and B meet each other at the same time. The distance between a and B is 60km
At the time of meeting, car a went through 80 (80 + 60) = 4 / 7 of the whole journey
The length of the whole journey is 40 (4 / 7-1 / 2) = 560km
A: the whole journey is 560 kilometers long
The two cars run from A. B to A. B at the same time. Car a travels 80 kilometers per hour, while car B travels 60 kilometers per hour. When the two cars meet, it is 40 kilometers from the midpoint of the whole journey,
When the two cars met, they were 40 kilometers away from the midpoint of the whole journey
A drives 40 * 2 more than B = 80 km
The time of meeting is 80 (80-60) = 4 hours
AB distance (80 + 60) * 4 = 560km
A and B start from AB and arrive at B at 4 o'clock. A travels 60 kilometers per hour and B 80 kilometers per hour. What's the whole journey
A / b speed ratio = 60:80 = 3:4
When we meet. 3 / 7 of the whole journey
Then it takes 4 / (1-3 / 7) = 7 hours for the whole process
So the whole journey = 60 × 7 = 420 km
The distance between a and B is 525km. A car and a freight car leave from the two places and meet in 3.5 hours. It is known that the car travels 80km per hour,
How many kilometers per hour does the truck travel?
525÷3.5-80
=150-80
=70 (km)
A: trucks travel 70 kilometers per hour
You can ask me if you don't understand my answer!
525/3.5－80
=180-80
=70km
The freight car travels x kilometers per hour
(80+x)*3.5=525
80+x=525÷3.5
80+x=150
x=70
3.5 * 80 = 280 (km) 525-280 = 245 (km) 245 / 3.5 = 70 (km)
The truck runs 70 km / h (∩)_ ∩)o
The chord length of the line x + 2Y + 1 = 0 cut by the circle (X-2) 2 + (Y-1) 2 = 25 is equal to ()
A. 25B. 35C. 45D. 55
The distance from the center of the circle (2, 1) to the straight line x + 2Y + 1 = 0 is d = | 2 + 2 + 1 | 1 + 4 = 5, and the radius of the circle is r = 5, so the chord length is 2r2 − D2 = 45, so C
To transport 78 tons of goods from city a to city B, the freight is 110 yuan if you use a large truck with a carrying capacity of 5 tons; the freight is 50 yuan if you use a small truck with a carrying capacity of 2 tons. To save the freight, how many trucks are needed to transport this batch of goods?
110 △ 5 = 22 (yuan), 50 △ 2 = 25 (yuan); 22 ＜ 25, so try to rent large trucks, 78 △ 5 = 15 (units) 3 tons; in order to fully load, you can rent 14 carts, (5 + 3) △ 2 = 4 small cars, so rent 14 carts, 4 small cars are the cheapest, 110 × 14 + 50 × 4, = 1540 + 200, = 1740 (yuan); answer
Two people count in turn. Each person can count one, two or three at a time, but they can't count. For example, the first person counts one or two
It's mainly to make up a multiple of 4, so that the last few can win
If the first person counts one number, then three; first two, then two; first three, then one
In this way, the latter one can count to all the multiples of 4, and he will also be able to count to 100
The distance between a and B is s kilometers. Someone plans to arrive in t hours. If he arrives 3 hours earlier, he should walk an extra () kilometers per hour
．．．．．．．．．．．
Time ratio T: (T-3)
Speed ratio (T-3): t
Original speed s / T
Walk more every hour:
s/t÷(t-3)*(t-t+3)
=s/t÷(t-3)*3
=3s/[t(t-3)]
I read the wrong question just now
New speed s / (T-3)
Original speed s / T
Walk more S / (T-3) - S / T per hour
If the sum of two numbers is known to be root 2 and the product is equal to minus 1 / 4, the sum of two numbers is known to be root 2 and the product is equal to minus 1 / 4
They are the two roots of the equation x ^ 2-radical 2x-1 / 4 = 0
Just find the equation
In the fruit base, 14 tons of apples are transported to the market, 4 tons by large truck, and the freight is 100 yuan; 2 tons by small truck, and the freight is 60 yuan
The amount of one truck for large trucks is 2 for small trucks, but it costs 120 yuan for two trucks, which is more than that of large trucks, so we should use large trucks as much as possible
In other words, there are 3 large trucks, 12 tons and 1 small truck
Freight: 3 * 100 + 60 = 360
RELATED INFORMATIONS
- 1. The speed ratio of the bus to the truck is 5:3, and the bus travels 40 kilometers per hour to find the road length
- 2. The speed ratio of the car to the truck is 4:7. The car and the truck leave from two places and meet 15 kilometers away from the midpoint. How many kilometers did the truck travel?
- 3. A and B vehicles leave from ab at the same time. It is known that a vehicle travels 50 kilometers per hour and B vehicle 40 kilometers per hour. When a vehicle meets B vehicle, a vehicle travels 40 kilometers more than B vehicle. The distance is calculated
- 4. Car a and car B start from the East and west at the same time and travel in opposite directions. Car a travels 48 kilometers per hour and car B 42 kilometers per hour. The two cars meet 21 kilometers from the midpoint to find the distance between the East and the West______ Kilometers
- 5. A and B run from a and B at the same time. The two cars meet at 50 kilometers from the midpoint. A travels 30 kilometers per hour, B travels 20% more than a
- 6. A and B cars run from AB to each other at the same time. A car travels 48 kilometers per hour, B car travels 50 kilometers per hour. When they meet, B car travels 10 kilometers more than a car. How many kilometers is the distance between AB and B
- 7. Car a and car B run from a and B at the same time. Car a runs 56 kilometers per hour and car B runs 48 kilometers per hour. The two cars meet at 32 kilometers from the midpoint. How many kilometers is the distance between a and B?
- 8. A and B two cars from AB two places, a 56 kilometers per hour, B 48 kilometers per hour, two cars from the midpoint 32 meters meet
- 9. A and B vehicles travel from ab at the same time. A vehicle travels 80 kilometers per hour, B vehicle travels 100 kilometers per hour. The two vehicles meet at 60 kilometers from the midpoint How many kilometers are the two places apart
- 10. A and B vehicles run from AB to ab at the same time. A vehicle runs 60 kilometers per hour and B vehicle runs 48 kilometers per hour. The two vehicles meet at 12 kilometers away from the midpoint. At this time, B vehicle is far away from ab How many kilometers are there at point a
- 11. A and B two cars from both sides of AB at the same time, meet for the first time at 60 kilometers away from a, after meeting continue to move forward, each arrived at the other's starting place immediately On the way back, I met again 40 kilometers away from A. how many kilometers away is ab
- 12. The two cars leave AB at the same time. A drives 45 kilometers per hour and B 48 kilometers per hour. After the first meeting, the two cars continue to move forward After the two cars arrived at AB, they immediately went back to the original road. The two cars drove for 3 hours from the beginning to the second meeting. How many kilometers are there between the two places?
- 13. A and B leave from ab at the same time. B, a travels 50 kilometers per hour, B 40 kilometers per hour. When they meet, a travels 40 kilometers more than B Kilometer, seek the distance between two places
- 14. A and B leave from ab respectively. Car a travels 96 kilometers per hour, and car B 88 kilometers per hour. When they meet, they are 40 kilometers away from the midpoint of ab. how many kilometers are ab from each other?
- 15. A and B start from AB and run in opposite directions at the same time. A runs 40 kilometers per hour and B 35 kilometers per hour. The two cars meet at 15 kilometers from the midpoint B how many kilometers are there between the two places? Solve by equation
- 16. The first time they met at a distance of 7 km from B After meeting, they continue to drive forward. When they arrive at their destination, they return immediately. When they return, they meet at a distance of 4km from A. how many kilometers is the distance between a and B?
- 17. The speed ratio of the two vehicles is 7:11. After the first meeting, the two vehicles continue to move in the same direction and reach the destination respectively Return immediately after the end. When the second meeting, car a is 80 kilometers away from B. how many kilometers are there between a and B?
- 18. Party A and Party B face each other from a and B, and the speed ratio is 7:4. After the first meeting, they continue to move forward and return to the destination immediately. On the way, they meet for the second time. The second meeting is 10 meters away from A. how far is the distance between the two places?
- 19. Party A and Party B are facing each other from a and B at the same time. The first time they meet is 40 kilometers away from A. after meeting, they still advance at the same speed, return to the destination immediately, and meet again at 20 kilometers away from A. how many kilometers is the distance between a and B?
- 20. When car a runs 80% of the whole journey and car B is 20 km away from 70% of the whole journey, the distance between the two cars is 40 km. How many meters is the distance between car a and car B?