The distance between City Z and City A was 990 km apart. A bus travelled at an average speed of 90 km/h from City Z to City A. At the same time, a lorry travelled at an average speed of 75 km/h from City A to City Z. 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
= 90 + 75
= 165 km/h
Time taken for the bus and the lorry to meet
= 990 ÷ 165
= 6 h
Difference in the speed between the bus and the lorry
= 90 - 75
= 15 km/h
Distance that the bus travelled further than the lorry
= 6 x 15
= 90 km
Answer(s): 90 km