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It is known that train a runs 120 kilometers per hour and train B 150 kilometers per hour, It is known that train a runs 120 kilometers per hour and train B 150 kilometers per hour 1. What is the ratio of the time when the two trains meet? 2. What is the ratio of the time taken by a and B trains to complete the whole journey?
1. Because Party A and Party B leave at the same time and meet at the same time, the time used is the same, so the time ratio of the two trains is 1:1
2. If the distance between a and B is set as X, then (x / 120): (x / 150) can be obtained according to the demand, and the time ratio of a and B trains to complete the whole journey is 5:4
A. B is x kilometers away from each other. A and B trains run from each other at the same time. Car a runs 120 kilometers per hour, while car B runs 100 kilometers per hour,
When two cars travel completely, the distance ratio (): () and the time ratio
When the two vehicles travel completely, the distance ratio is (6): (5), and the time ratio is 1:1
Because the speed is much faster, and the distance ratio is equal to the speed ratio. In terms of time, two cars start at the same time, and the time is the same, that is 1:1
Starting at the same time, the same time, the distance ratio is equal to the speed ratio of 120; 100 = 6:5, the same is 1:1
A. The distance between B and a is x km. A and B trains leave each other at the same time. Car a travels 120 km per hour, while car B travels 100 km per hour. When they meet, the distance ratio of the two trains is (): (), and the time ratio is (): (). When the two trains travel completely, their distance ratio is (): (), and the time ratio is (): ()
A. The distance between B and a is x kilometers. A and B trains leave each other at the same time. Car a travels 120 kilometers per hour, while car B travels 100 kilometers per hour. When they meet, the distance ratio of the two trains is 120t: 100t = 6:5
The time ratio is 1:1
When two cars travel a full distance, their distance ratio is 1:1
The time ratio is 100:120 = 5:6
A. B is x kilometers away from each other. A and B trains leave each other at the same time. Car a travels 120 kilometers per hour, while car B travels 100 kilometers per hour. When they meet, the distance ratio of the two trains is 120t: 100t = 6:5.
The time ratio is 1:1.
When two cars travel a full distance, the distance is the same, and their distance ratio is 1:1.
If the whole process is set to 1, the time for a to complete the line is 1 / 120, and that for B is 1 / 100. The time ratio is 1 / 120:1 / 100 = 5:6. ... unfold
A. B is x kilometers away from each other. A and B trains leave each other at the same time. Car a travels 120 kilometers per hour, while car B travels 100 kilometers per hour. When they meet, the distance ratio of the two trains is 120t: 100t = 6:5.
The time ratio is 1:1.
When two cars travel a full distance, the distance is the same, and their distance ratio is 1:1.
If the whole process is set to 1, the time for a to complete the line is 1 / 120, and that for B is 1 / 100. The time ratio is 1 / 120:1 / 100 = 5:6. Put it away
Three shirts and five bottles of mineral water cost 79 yuan, two shirts and three bottles of mineral water cost 52 yuan, and one shirt and one bottle of mineral water cost () yuan?
52 × 1.5 = 78 yuan, which is the price of 3 shirts and 4.5 bottles of mineral water. Then the price of 0.5 bottle of mineral water is 79-78 = 1 yuan, the price of mineral water is 1 △ 0.5 = 2 yuan, and the price of shirt is (52-2 × 3) △ 2 = 23 yuan
A. The distance between the two places is 360 kilometers. A and B start from both places at the same time and run in opposite directions. They meet three hours later. It is known that the speed ratio of a to B is 7:5, so we can find the speed of B
360 △ 3 = 120 (km), the speed of car B accounts for a few parts of the sum of the speed of car a and B: 5 △ 7 + 5 = 512120 × 512 = 50 (km); answer: the speed of car B is 50 km
Mathematics problems in grade three of junior high school
The number of integer solutions (x, y) of the equation whose root x plus root y equals root 336 is not only the answer, but also the thinking
From the meaning of the title, we can see that the value ranges of X and y are 0 ≤ √ x ≤ √ 336 and 0 ≤ √ y ≤ √ 336. The original formula is rewritten as y = (4 √ 21 - √ x) ^ 2 = 336 + X - 8 √ 21 · √ x ∵ y is an integer. We can know that x is the product of the square of 21 and another integer. We can set X = 21 · a ^ 2 (a is an integer) ∵ y = 21 (4-A) ^ 2 according to the
The power of a car is 14.2 kW. When driving on a flat road, the speed can reach 25 kilometers per second. How much resistance does the car suffer at this time
S = 90000 M / S = 25
F resistance = w / S = P * t / S = 14200w * 3600s / 90000M = 568n
What is the quality of a bottle of mineral water
The mass of 500ml water is 0.5kg, a bottle of mineral water is about 550ml, and the weight of the bottle can be ignored, about 0.55kg
The density of water is 1.0g/cm3, 1cm3 = 1ml, mass = density * volume
Generally, the quality of 550ml mineral water is 550 * 1.0 = 550G, which is a little more than a catty
A. The distance between B and B is 160 kilometers. A and B vehicles leave from both places at the same time. After 5 / 4 hours of meeting, it is known that the speed ratio of a and B vehicles is 3:5. How many kilometers does a and B vehicles travel per hour?
160 / 4 / 5 = 200
If car a travels 3x kilometers per hour, the equation 3x × 5 / 4 + 5x × 5 / 4 = 160 can be solved
It is known that the lengths of the three sides of the triangle are respectively 20 cm, 40 cm and 45 cm of the root. The perimeter of the triangle is calculated (the result needs to be simplified)
Perimeter of triangle = √ 20 + √ 40 + √ 45 = 2 √ 5 + 2 √ 10 + 3 √ 5 = 5 √ 5 + 2 √ 10
RELATED INFORMATIONS
- 1. The two trains of Party A and Party B depart from two places 275km apart and meet 2.5 hours later. It is known that the speed of train B is 60km per hour, How many kilometers does car a travel per hour Fang Chengjie
- 2. A and B trains leave from a and B at the same time. After five hours' meeting, the two trains still run at the same speed It takes another 4 hours to drive to B. It is known that car a travels 10 kilometers more per hour than car B. how many kilometers are there between the two places? 2. How many days will it take for the maintenance team to repair 1500 air tanks in 10 days with 30 people? How many days will it take to repair 9000 air tanks with 30 people The first question is not necessary 1. A and B trains leave from a and B at the same time. After 5 hours of meeting, the two trains still drive at the same speed, and then drive to B after 4 hours. It is known that car a travels 10 kilometers more per hour than car B. how many kilometers are there between the two places?
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- 4. The two trains of Party A and Party B start from the same city and run in opposite directions. The speed of train a is 36 km / h, and that of train B is 48 km / h. It is known that train a starts 2 hours earlier than train B After how many hours, B catch up with a
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- 6. The two trains run from two places 450 kilometers apart and meet each other in five hours. It is known that the speed ratio of the two trains is 4:5. How many kilometers do the two trains travel per hour?
- 7. A and B two trains from 450 kilometers away from the two places at the same time, after five hours just met, known a and B two car speed ratio is 4:5, two trains every hour how many kilometers? Tell me why? Good 50 minutes!
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- 9. The distance between a and B is 360 km. A car from a to B runs 108 km in 2 hours. According to this calculation, it will take several hours to complete the whole journey Make no mistake, 108 kilometers in 2 hours
- 10. How many hours does it take for a car to travel from a to B in 3.5 hours? As above
- 11. A and B trains run from 822 kilometers apart at the same time. A trains 65 kilometers per hour, B trains 72 kilometers per hour. A few hours later, the two trains meet?
- 12. The two trains leave 500 kilometers apart at the same time, but they don't meet each other four hours later. They are 20 kilometers apart. It is known that car a travels 65 kilometers per hour, and how many kilometers does car B travel per hour?
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- 14. After 7 hours' meeting, car a is 6 kilometers faster than car B per hour, and the speed is 5; 6. How many kilometers is the distance between two places? Use the equation
- 15. The distance between a and B is 480km. Two cars a and B start from two places at the same time and run in opposite directions. They meet in six hours. It is known that the speed ratio of a and B is 9:7. What is the speed of a and B?
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