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A boat is sent across a river with a vel...

A boat is sent across a river with a velocity 8 `kmh^(-1)` If the resultant velocity of boat is `10h^(-1)`,then velocity of the river is

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The correct Answer is:
6 km `h^(-1)`
`vecV_("River ") = vecV_("resultant") - vecV_("man")`
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