Question

A motorist travelled from town A to town B at an average speed of 60km/hr. In his return journey he increased the speed by 30km/hr. What was his average speed for the whole journey?
1/60 + 1/90 = 2/s
s = 72 km/hr

Related Questions

suppose a car is driven from town A to town B from town B to town C and from town C to town D which... A train travels 540km at an average speed of 30km/h. On the return journey the average speed is doub... A motorist travelled 48km at an average speed of 30km/h. If he made a returned journey at an average...