The distance between City B and City C was 930 km apart. A lorry travelled at an average speed of 81 km/h from City B to City C. At the same time, a van travelled at an average speed of 74 km/h from City C to City B. 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
= 81 + 74
= 155 km/h
Time taken for the lorry and the van to meet
= 930 ÷ 155
= 6 h
Difference in the speed between the lorry and the van
= 81 - 74
= 7 km/h
Distance that the lorry travelled further than the van
= 6 x 7
= 42 km
Answer(s): 42 km