The distance between a and B is 520 km. It takes 8 hours for a truck to go from a to B, and 10 hours for a bus to go from B to a. the two cars go from a to B at the same time. After a few hours, the distance between the two cars is 52 km

The distance between a and B is 520 km. It takes 8 hours for a truck to go from a to B, and 10 hours for a bus to go from B to a. the two cars go from a to B at the same time. After a few hours, the distance between the two cars is 52 km

Truck speed = 520 / 8 = 65 km / h
Bus speed = 520 / 10 = 52 km / h
The distance between the two vehicles is 52km, there are two situations:
1. The two cars did not meet
This time = (520-52) / (65 + 52) = 4 hours
2. After the two cars met
Time = (520 + 52) / (65 + 52) = 4.8/9 hours or 4.89 hours
Hope it helps!