The distance between City D and City E was 750 km apart. A lorry travelled at an average speed of 80 km/h from City D to City E. At the same time, a car travelled at an average speed of 70 km/h from City E to City D. 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
= 80 + 70
= 150 km/h
Time taken for the lorry and the car to meet
= 750 ÷ 150
= 5 h
Difference in the speed between the lorry and the car
= 80 - 70
= 10 km/h
Distance that the lorry travelled further than the car
= 5 x 10
= 50 km
Answer(s): 50 km