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Kiran covers a certain distance at 80 km/h and returns back to the same point at 20 km/h. Then, the average speed during the whole journey be -


1. 35 km/h
2. 32 km/h
3. 30 km/h
4. 28 km/h

1 Answer

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Best answer
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.

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