The distance between City H and City J was 600 km apart. A car travelled at an average speed of 80 km/h from City H to City J. At the same time, a lorry travelled at an average speed of 70 km/h from City J to City H. 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
= 80 + 70
= 150 km/h
Time taken for the car and the lorry to meet
= 600 ÷ 150
= 4 h
Difference in the speed between the car and the lorry
= 80 - 70
= 10 km/h
Distance that the car travelled further than the lorry
= 4 x 10
= 40 km
Answer(s): 40 km