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a. B two places meet for 1200 kilometers, and a and B two cars leave from two places at the same time. After five hours, they are 150 kilometers apart, It is known that the speed ratio of car a and car B is 3:4. How many hours does it take car B to complete the whole journey
The speed ratio of car a and car B is 3:4, and the distance ratio is 3:4 at the same time
The sum of the five hour driving distance of the two cars is 1200-150 = 1050
B: 1050 / (3 + 40 * 4 = 600) in 5 hours
B speed = 600 / 5 = 120
The time for car B to complete the whole journey is 1200 / 120 = 10 hours
A batch of goods can be transported in 6 hours by large trucks and small trucks at the same time. If they are transported by large trucks alone, they can be transported in 10 hours. If they are transported by small trucks alone, how many hours will it take? (Changshan County, Zhejiang Province)
A: it takes 15 hours to transport by truck
How to count to 100
Listen to the sound of beetles crawling
A book written by a historian or poet
Whirling past us,
It's so dark that the sky can't roar past
In the dark of the book flavor
The dilemma is to make a decision. Ha ha
A. The distance between B and B is 1200 meters. After five hours, the distance between B and B is 150 kilometers, and the speed ratio is 3:4
How many hours does it take
A and B walked 1200-150 = 1050 km
B: 1050 X4 (3 + 4) = 600 km
B speed 600 △ 4 = 150 km / h
Five hours later, the distance between the two cars was 150 kilometers, and car a and car B traveled a total of 1200-150 = 1050 kilometers
The speed ratio of the two vehicles is 3:4, and vehicle B runs 4 / 7 of the total travel of the two vehicles
The speed of car B is 1050 × 4 / 7 △ 5 = 120 (km / h)
A batch of goods can be transported in eight hours by three large trucks and nine hours by four small trucks. Now it can be transported in a few hours by two large trucks and small trucks at the same time
Use arithmetic
24X=36Y 2X=3Y
X+Y=5/3X
5/3X*K=24X
K=14.4
Two people take turns to count, each person can count one, two and three, can not count, from 1 to 100, who counts to 100 who wins, how to win
1. Two people count in turn. Each person can count one, two and three. They have to count from one to 100. Whoever counts to 100 wins. How can they win?
The latter will win
First count one, then count three
The first number is 2, and the second number is 2
The first number is three, and the last one is one
The one upstairs is right,
The distance between a and B is 1200km, and the distance between a and B is 150km after 5 hours. It is known that the speed ratio of a and B is 3:4, and B runs completely
How many hours
whasdqwe,
The two vehicles travel together every hour:
(1200-150) △ 5 = 210 (km)
Vehicle B runs every hour:
210 × 4 / (3 + 4) = 120 (km)
B car to complete the whole journey:
1200 △ 120 = 10 (hours)
Learn from: speed and speed
（1200-150）÷5=210km
B speed
210x4/(3+4)=120km
It's necessary for car B to finish the whole journey
1200 △ 120 = 10 hours^^
How many hours does it take for a batch of goods to be transported by trucks in 6 hours, by small trucks in 10 hours and by two trucks at the same time?
Ten
The mother chicken led her children out to look for food. In order to prevent the chicken from losing, she counted from the back to the front until she was 8; from the front to the back, until she was 9. The mother chicken finally counted out that she had 17 children, but she clearly knew that she did not have so many children. Excuse me: how many children did the confused mother chicken have? Why did the mother chicken count wrong?
There are seven baby chickens
How much is the distance between Li a and Wang B? (the distance between Li a and Wang B is known to be 3 kilometers, and the distance between them is 4 minutes,
1200-150 = 1050 (kilometer) 1050 / 5 = 210 (kilometer) 210 * 4 / 7 = 120 (kilometer / hour) 1200 / 120 = 10 (hour) answer: it takes 10 hours for B line to complete
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