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A body has speed V, 2V and 3V in first 1/3^rd of distance S, second 1/3rd of S and third 1/3^rdof S respectively. Its average speed will be

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18v/11

11v/18

answer is A.

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Detailed Solution

$v_{a v} = \frac{Total ⥄ distance}{Time ⥄ taken} = \frac{x}{\frac{x / 3}{v} + \frac{x / 3}{2 v} + \frac{x / 3}{3 v}}$
$= \frac{18}{11} v$

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