The distance between City H and City J was 640 km apart. A lorry travelled at an average speed of 88 km/h from City H to City J. At the same time, a van travelled at an average speed of 72 km/h from City J to City H. How much further did the lorry travel than the van when the lorry met the van on the way?
Combined speed of the lorry and the van
= 88 + 72
= 160 km/h
Time taken for the lorry and the van to meet
= 640 ÷ 160
= 4 h
Difference in the speed between the lorry and the van
= 88 - 72
= 16 km/h
Distance that the lorry travelled further than the van
= 4 x 16
= 64 km
Answer(s): 64 km