A and B vehicles leave from ab at the same time. When they meet, the distance ratio of a and B vehicles is 4:3 A and B two cars, at the same time from AB two relative departure, meet a and B distance ratio is 4:3, after meeting, B faster than a 12 kilometers per hour, a still at the same speed forward, the result of two people at the same time to reach the destination, B car finished the whole journey share 8 hours

A and B vehicles leave from ab at the same time. When they meet, the distance ratio of a and B vehicles is 4:3 A and B two cars, at the same time from AB two relative departure, meet a and B distance ratio is 4:3, after meeting, B faster than a 12 kilometers per hour, a still at the same speed forward, the result of two people at the same time to reach the destination, B car finished the whole journey share 8 hours

The time after meeting = 12 × 3 / 7 = 36 / 7 hours, 12 kilometers faster per hour, the second line is 12 × 36 / 7 = 432 / 7 kilometers, the first line is 1 / 7 more than the second line, then the whole journey = (432 / 7) / (1 / 7) = 432 kilometers

The ratio of walking speed between a and B is 3:2. A and B start from a and B at the same time. If they go in opposite directions, they will meet in an hour. If they go in the same direction, how long does it take for a to catch up with B?

A: it takes 5 hours for a to catch up with B