The distance between City G and City H was 870 km apart. A bus travelled at an average speed of 89 km/h from City G to City H. At the same time, a lorry travelled at an average speed of 85 km/h from City H to City G. How much further did the bus travel than the lorry when the bus met the lorry on the way?
Combined speed of the bus and the lorry
= 89 + 85
= 174 km/h
Time taken for the bus and the lorry to meet
= 870 ÷ 174
= 5 h
Difference in the speed between the bus and the lorry
= 89 - 85
= 4 km/h
Distance that the bus travelled further than the lorry
= 5 x 4
= 20 km
Answer(s): 20 km