The distance between City R and City S was 790 km apart. A lorry travelled at an average speed of 88 km/h from City R to City S. At the same time, a car travelled at an average speed of 70 km/h from City S to City R. How much further did the lorry travel than the car when the lorry met the car on the way?
Combined speed of the lorry and the car
= 88 + 70
= 158 km/h
Time taken for the lorry and the car to meet
= 790 ÷ 158
= 5 h
Difference in the speed between the lorry and the car
= 88 - 70
= 18 km/h
Distance that the lorry travelled further than the car
= 5 x 18
= 90 km
Answer(s): 90 km