The distance between City Y and City Z was 860 km apart. A lorry travelled at an average speed of 89 km/h from City Y to City Z. At the same time, a bus travelled at an average speed of 83 km/h from City Z to City Y. 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
= 89 + 83
= 172 km/h
Time taken for the lorry and the bus to meet
= 860 ÷ 172
= 5 h
Difference in the speed between the lorry and the bus
= 89 - 83
= 6 km/h
Distance that the lorry travelled further than the bus
= 5 x 6
= 30 km
Answer(s): 30 km