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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 is1. 30 kmph.2. 30.8 kmph3. 26.6 kmph4. 32.6 kmph |
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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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