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Wind is blowing to east along two parallel railway tracks. Two trains moving with the same speed in opposite direction have the steam track of one double that of the other. The speed of each train is

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Equal to that of the wind

Double that of the wind

Half that of the wind

Three times that of the wind

answer is B.

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Detailed Solution

$v_{1, rel} = v - v_{w}; v_{2, rel} = v + v_{w}$

$2 (v_{1, rel}) = v_{2, rel} \Rightarrow v + v_{w} = 2 (v - v_{w})$

$\Rightarrow v = 3 v_{w}$

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