A and B two cars from 720 kilometers away from the two places at the same time to the back. A 100 kilometers per hour, B 80 kilometers per hour, a few hours later, the two cars apart

A and B two cars from 720 kilometers away from the two places at the same time to the back. A 100 kilometers per hour, B 80 kilometers per hour, a few hours later, the two cars apart

A few hours later, the two cars are 1670 kilometers apart?
Actual driving distance = 1670-720 = 950km
The sum of a and B speed = 100 + 80 = 180 km / h
Driving time = 950 △ 180 = 5 5 / 18 hours
A: 5 and 5 / 18 hours later, the two cars are 1670 km apart
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The distance from a to B is 120 kilometers. A and B leave from both places at the same time. After 0.8 hours, they meet. A runs 90 kilometers per hour, B runs how many kilometers per hour

120÷0.8-90＝150-90＝60
A: car B is 60 kilometers per hour

A. B is 840 km away from the two places. A and B leave each other from ab. a runs 9 km per hour and B 120 km per hour
Two cars meet?

Car a should travel 90 kilometers per hour!
Two cars meet and pass by:
840/(90+120)
=840/210
=4 hours

Car a runs 90 kilometers per hour. Three hours after driving from a, car B starts from a at a speed of 120 kilometers per hour to catch up with car a. a few hours later, car B catches up with car a?

（90×3）÷（120-90）
=270÷30
=9 (hours)