1. Car a and car B travel from two places 825 kilometers apart. Car a travels 70 kilometers per hour and car B 80 kilometers per hour, A few hours later, the distance between the two cars is 75 km? 2. A and B cars travel from two places 825 km apart. A car travels 70 km per hour, and the speed ratio between a car and B car is 7:8 per hour. A few hours later, the distance between the two cars is 75 km?

1. Car a and car B travel from two places 825 kilometers apart. Car a travels 70 kilometers per hour and car B 80 kilometers per hour, A few hours later, the distance between the two cars is 75 km? 2. A and B cars travel from two places 825 km apart. A car travels 70 km per hour, and the speed ratio between a car and B car is 7:8 per hour. A few hours later, the distance between the two cars is 75 km?

1. (825-75) / (70 + 80) = 5 hours
2. The second question is basically the same as the first one. First, find out the speed of car B 70 * 8 / 7 = 80
Then (825-75) / (70 + 80) = 5 hours

A and B two cars from a to B at the same time, a car 80 kilometers per hour, B car 72 hours per hour before perplexed. 2.5 hours later, a car to B, then B car from B how many kilometers

80 × 2.5-72 × 2.5 = 20 km