The distance between City L and City M was 620 km apart. A lorry travelled at an average speed of 82 km/h from City L to City M. At the same time, a sports car travelled at an average speed of 73 km/h from City M to City L. How much further did the lorry travel than the sports car when the lorry met the sports car on the way?
Combined speed of the lorry and the sports car
= 82 + 73
= 155 km/h
Time taken for the lorry and the sports car to meet
= 620 ÷ 155
= 4 h
Difference in the speed between the lorry and the sports car
= 82 - 73
= 9 km/h
Distance that the lorry travelled further than the sports car
= 4 x 9
= 36 km
Answer(s): 36 km