The distance between City P and City Q was 720 km apart. A bus travelled at an average speed of 96 km/h from City P to City Q. At the same time, a lorry travelled at an average speed of 84 km/h from City Q to City P. 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
= 96 + 84
= 180 km/h
Time taken for the bus and the lorry to meet
= 720 ÷ 180
= 4 h
Difference in the speed between the bus and the lorry
= 96 - 84
= 12 km/h
Distance that the bus travelled further than the lorry
= 4 x 12
= 48 km
Answer(s): 48 km