The distance between City U and City V was 900 km apart. A bus travelled at an average speed of 100 km/h from City U to City V. At the same time, a lorry travelled at an average speed of 80 km/h from City V to City U. 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
= 100 + 80
= 180 km/h
Time taken for the bus and the lorry to meet
= 900 ÷ 180
= 5 h
Difference in the speed between the bus and the lorry
= 100 - 80
= 20 km/h
Distance that the bus travelled further than the lorry
= 5 x 20
= 100 km
Answer(s): 100 km