The distance between City X and City Y was 900 km apart. A lorry travelled at an average speed of 93 km/h from City X to City Y. At the same time, a bus travelled at an average speed of 87 km/h from City Y to City X. 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
= 93 + 87
= 180 km/h
Time taken for the lorry and the bus to meet
= 900 ÷ 180
= 5 h
Difference in the speed between the lorry and the bus
= 93 - 87
= 6 km/h
Distance that the lorry travelled further than the bus
= 5 x 6
= 30 km
Answer(s): 30 km