The distance between City H and City J was 620 km apart. A lorry travelled at an average speed of 84 km/h from City H to City J. At the same time, a convertible travelled at an average speed of 71 km/h from City J to City H. How much further did the lorry travel than the convertible when the lorry met the convertible on the way?
Combined speed of the lorry and the convertible
= 84 + 71
= 155 km/h
Time taken for the lorry and the convertible to meet
= 620 ÷ 155
= 4 h
Difference in the speed between the lorry and the convertible
= 84 - 71
= 13 km/h
Distance that the lorry travelled further than the convertible
= 4 x 13
= 52 km
Answer(s): 52 km