The distance between City W and City X was 640 km apart. A van travelled at an average speed of 83 km/h from City W to City X. At the same time, a lorry travelled at an average speed of 77 km/h from City X to City W. How much further did the van travel than the lorry when the van met the lorry on the way?
Combined speed of the van and the lorry
= 83 + 77
= 160 km/h
Time taken for the van and the lorry to meet
= 640 ÷ 160
= 4 h
Difference in the speed between the van and the lorry
= 83 - 77
= 6 km/h
Distance that the van travelled further than the lorry
= 4 x 6
= 24 km
Answer(s): 24 km