The distance between City M and City N was 990 km apart. A convertible travelled at an average speed of 86 km/h from City M to City N. At the same time, a lorry travelled at an average speed of 79 km/h from City N to City M. How much further did the convertible travel than the lorry when the convertible met the lorry on the way?
Combined speed of the convertible and the lorry
= 86 + 79
= 165 km/h
Time taken for the convertible and the lorry to meet
= 990 ÷ 165
= 6 h
Difference in the speed between the convertible and the lorry
= 86 - 79
= 7 km/h
Distance that the convertible travelled further than the lorry
= 6 x 7
= 42 km
Answer(s): 42 km