Correct Answer - Option 2 : 32 km/h
Given:
Kiran covers a certain distance 80 km/h and returns back to the same point at 20 km/h.
Formula used:
Average speed = 2S1S2/(S1 + S2)
Calculation:
According to the question,
The distance is same
Average speed = 2S1S2/(S1 + S2)
S1 = 80 km/hr & S2 = 20 km/h
⇒ 2 × 80 × 20/(80 + 20)
⇒ 3200/100
⇒ 32 km/h
∴ The average speed during the whole journey be 32 km/h.