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in Distance, Time and Speed by (237k points)
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A man goes uphill at an average speed of 24 kmph. and comes down at an average speed of 30 kmph., the distance travelled in both the cases being the same. The average speed of the entire journey is
1.  30 kmph.
2. 30.8 kmph
3. 26.6 kmph
4. 32.6 kmph

1 Answer

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Best answer
Correct Answer - Option 3 : 26.6 kmph

Given:

Average of speed during uphill (S1) = 24 kmph

Average of speed during down (S2) = 30 kmph

Formula used:

Average speed = (2 × S1 × S2)/(S1 + S2)

Calculation:

Average speed = (2 × 24 × 30)/(24 + 30)

⇒ 1440/54

⇒ 26.66 kmph

Hence, The average speed of the entire journey is 26.66 kmph.

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