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A and B are going from a and B at the same time. They meet 4.8 hours later. It is known that it takes 12 hours for a to go from a to B, and B to go from B to a How many hours does it take? And right!
The method is as follows:
We can use fractions to solve this problem, regarding the distance as the unit "1"
The speed sum of two cars can be regarded as 1 / 4.8 (5 / 24)
The speed of car a can be regarded as 1 / 12
Then the speed of car B is 1 / 4.8-1 / 12 = 1 / 8
It takes 1 △ 1 / 8 = 8 (hours) for car B to go to place B
A: it takes 8 hours for car B to drive from a to B
It takes 12 hours for car a to go from place a to place B, while car B travels 50 kilometers per hour. Now the two cars are going from place a to place B at the same time. When they meet, car a runs all the way
How many kilometers is the distance between A.B. and A.B?
The two cars walked for 12 * 7 / 12 = 7 hours when they met
Car B has traveled 7 * 50 = 350 km
The distance between the two places is 350 / (1-7 / 12) = 840 km
If you make an equation, it's OK
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