The distance between City W and City X was 990 km apart. A car travelled at an average speed of 85 km/h from City W to City X. At the same time, a lorry travelled at an average speed of 80 km/h from City X to City W. How much further did the car travel than the lorry when the car met the lorry on the way?
Combined speed of the car and the lorry
= 85 + 80
= 165 km/h
Time taken for the car and the lorry to meet
= 990 ÷ 165
= 6 h
Difference in the speed between the car and the lorry
= 85 - 80
= 5 km/h
Distance that the car travelled further than the lorry
= 6 x 5
= 30 km
Answer(s): 30 km