The distance between City M and City N was 780 km apart. A lorry travelled at an average speed of 82 km/h from City M to City N. At the same time, a convertible travelled at an average speed of 74 km/h from City N to City M. 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
= 82 + 74
= 156 km/h
Time taken for the lorry and the convertible to meet
= 780 ÷ 156
= 5 h
Difference in the speed between the lorry and the convertible
= 82 - 74
= 8 km/h
Distance that the lorry travelled further than the convertible
= 5 x 8
= 40 km
Answer(s): 40 km