A car travels 120 km from A to B at 30 km per hour but retur

A car travels 120 km from A to B at 30 km per hour but returns the same distance at 40 km per hour. The average speed for the round trip is closest to

Solution

With 30km/h car travel 120 km in 4hours and return Journey of 120km in 3 hours.
so car travels total 240 km in 7 hours. So the average speed of car for this total journey is appro. 34.28km/hr(240km/7houres) i.e. closest to 34 km/hr.