The distance between City S and City T was 900 km apart. A van travelled at an average speed of 80 km/h from City S to City T. At the same time, a lorry travelled at an average speed of 70 km/h from City T to City S. 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
= 80 + 70
= 150 km/h
Time taken for the van and the lorry to meet
= 900 ÷ 150
= 6 h
Difference in the speed between the van and the lorry
= 80 - 70
= 10 km/h
Distance that the van travelled further than the lorry
= 6 x 10
= 60 km
Answer(s): 60 km