The distance between City Z and City A was 780 km apart. A lorry travelled at an average speed of 82 km/h from City Z to City A. At the same time, a van travelled at an average speed of 74 km/h from City A to City Z. 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
= 82 + 74
= 156 km/h
Time taken for the lorry and the van to meet
= 780 ÷ 156
= 5 h
Difference in the speed between the lorry and the van
= 82 - 74
= 8 km/h
Distance that the lorry travelled further than the van
= 5 x 8
= 40 km
Answer(s): 40 km