A person travels by motorcycle to a place at an average speed of 60 km/h and returns at an average speed of 30 km/h. Find his average speed (in km/h) for the whole journey.

Correct option is A

Given:
S₁= 60 km/h
S₂ = 30 km/h

Formula Used:

​$$\text{Average Speed} = \frac{2 \times S_1 \times S_2}{S_1 + S_2}$$​​

where $$S_1$$​ and$$S_2$$​ are the speeds in the two directions.

Solution:

​$$\text{Average Speed} = \frac{2 \times 60 \times 30}{60 + 30} = \frac{3600}{90} = 40 \text{ km/h}$$