A person goes to his office from his home at the speed of

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A person goes to his office from his home at the speed of 4 km/h and return back at the speed of 6 km/h. Find the average speed of the person ?

1. 4.5 km/h
2. 5 km/h
3. 10 km/h
4. 4.8 km/h

Correct Option: D

Average speed = 2ab/(a+b)
= (2 x 4 x 6)/(4 + 6)
= 48/10
= 4.8 km/h