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A ship is moving at 40 km*h^(-1) towards...

A ship is moving at `40 km*h^(-1)` towards west. Another is proceeding southward at `30 km *h^(-1)` . Find the relative velocity of the second ship with respect to the first.

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The correct Answer is:
`50 km*h^(-1)` , inclined towards east making an angle `tan ^(-1)"" 4/3 ` with the south
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