The distance between City H and City J was 640 km apart. A bus travelled at an average speed of 90 km/h from City H to City J. At the same time, a van travelled at an average speed of 70 km/h from City J to City H. How much further did the bus travel than the van when the bus met the van on the way?
Combined speed of the bus and the van
= 90 + 70
= 160 km/h
Time taken for the bus and the van to meet
= 640 ÷ 160
= 4 h
Difference in the speed between the bus and the van
= 90 - 70
= 20 km/h
Distance that the bus travelled further than the van
= 4 x 20
= 80 km
Answer(s): 80 km