A person goes from one point to another point with a speed

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A person goes from one point to another point with a speed of 5 km/h and comes back to starting point with a speed of 3 km/h. Find the average speed for the whole journey.?

1. 4.5 km/h
2. 4 km/h
3. 4. 25 km/h
4. 3. 75 km/h

Correct Option: D

Average speed = 2AB/(A + B)
= 2 x 5 x 3/(5 + 3)
= 30/8
= 3.75 km/h