The distance between City R and City S was 810 km apart. A car travelled at an average speed of 85 km/h from City R to City S. At the same time, a lorry travelled at an average speed of 77 km/h from City S to City R. 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 + 77
= 162 km/h
Time taken for the car and the lorry to meet
= 810 ÷ 162
= 5 h
Difference in the speed between the car and the lorry
= 85 - 77
= 8 km/h
Distance that the car travelled further than the lorry
= 5 x 8
= 40 km
Answer(s): 40 km