The distance between City Z and City A was 660 km apart. A convertible travelled at an average speed of 84 km/h from City Z to City A. At the same time, a lorry travelled at an average speed of 81 km/h from City A to City Z. 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
= 84 + 81
= 165 km/h
Time taken for the convertible and the lorry to meet
= 660 ÷ 165
= 4 h
Difference in the speed between the convertible and the lorry
= 84 - 81
= 3 km/h
Distance that the convertible travelled further than the lorry
= 4 x 3
= 12 km
Answer(s): 12 km