The distance between City Y and City Z was 840 km apart. A lorry travelled at an average speed of 94 km/h from City Y to City Z. At the same time, a car travelled at an average speed of 74 km/h from City Z to City Y. 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
= 94 + 74
= 168 km/h
Time taken for the lorry and the car to meet
= 840 ÷ 168
= 5 h
Difference in the speed between the lorry and the car
= 94 - 74
= 20 km/h
Distance that the lorry travelled further than the car
= 5 x 20
= 100 km
Answer(s): 100 km