The distance between City N and City P was 960 km apart. A lorry travelled at an average speed of 81 km/h from City N to City P. At the same time, a van travelled at an average speed of 79 km/h from City P to City N. 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 + 79
= 160 km/h
Time taken for the lorry and the van to meet
= 960 ÷ 160
= 6 h
Difference in the speed between the lorry and the van
= 81 - 79
= 2 km/h
Distance that the lorry travelled further than the van
= 6 x 2
= 12 km
Answer(s): 12 km