The distance between City K and City L was 660 km apart. A van travelled at an average speed of 85 km/h from City K to City L. At the same time, a lorry travelled at an average speed of 80 km/h from City L to City K. 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
= 85 + 80
= 165 km/h
Time taken for the van and the lorry to meet
= 660 ÷ 165
= 4 h
Difference in the speed between the van and the lorry
= 85 - 80
= 5 km/h
Distance that the van travelled further than the lorry
= 4 x 5
= 20 km
Answer(s): 20 km