The distance between City X and City Y was 780 km apart. A van travelled at an average speed of 80 km/h from City X to City Y. At the same time, a lorry travelled at an average speed of 76 km/h from City Y to City X. How much further did the van travel than the lorry when the van met the lorry on the way?
Combined speed of the van and the lorry
= 80 + 76
= 156 km/h
Time taken for the van and the lorry to meet
= 780 ÷ 156
= 5 h
Difference in the speed between the van and the lorry
= 80 - 76
= 4 km/h
Distance that the van travelled further than the lorry
= 5 x 4
= 20 km
Answer(s): 20 km