The distance between City G and City H was 720 km apart. A lorry travelled at an average speed of 91 km/h from City G to City H. At the same time, a bus travelled at an average speed of 89 km/h from City H to City G. How much further did the lorry travel than the bus when the lorry met the bus on the way?
Combined speed of the lorry and the bus
= 91 + 89
= 180 km/h
Time taken for the lorry and the bus to meet
= 720 ÷ 180
= 4 h
Difference in the speed between the lorry and the bus
= 91 - 89
= 2 km/h
Distance that the lorry travelled further than the bus
= 4 x 2
= 8 km
Answer(s): 8 km