The distance between City Y and City Z was 860 km apart. A van travelled at an average speed of 90 km/h from City Y to City Z. At the same time, a lorry travelled at an average speed of 82 km/h from City Z to City Y. 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
= 90 + 82
= 172 km/h
Time taken for the van and the lorry to meet
= 860 ÷ 172
= 5 h
Difference in the speed between the van and the lorry
= 90 - 82
= 8 km/h
Distance that the van travelled further than the lorry
= 5 x 8
= 40 km
Answer(s): 40 km