The distance between City Y and City Z was 920 km apart. A lorry travelled at an average speed of 97 km/h from City Y to City Z. At the same time, a van travelled at an average speed of 87 km/h from City Z to City Y. 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
= 97 + 87
= 184 km/h
Time taken for the lorry and the van to meet
= 920 ÷ 184
= 5 h
Difference in the speed between the lorry and the van
= 97 - 87
= 10 km/h
Distance that the lorry travelled further than the van
= 5 x 10
= 50 km
Answer(s): 50 km