Dinesh goes from station P t0 station Q at the speed of 40 km/hr and returns from station Q to station P at the speed of 60 km/hr. Find his average speed for the whole journey.

Dinesh goes from station P t0 station Q at the speed of 40 km/hr and returns from station Q to station P at the speed of 60 km/hr. Find his average speed for the whole journey.
1). 50 km/hr
2). 45 km/hr
3). 52 km/hr
4). 48 km

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