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A boat moves right across a river with v...

A boat moves right across a river with velocity `10Kmh^(-1)` relative to water. The water has a uniform speed of `5.00Kmh^(-1)` relative to the earth. Find the velocity of the boat' relative to an observer standing on either bank. If the width of river is `3.0Km` , find the time it takes the baat to cross it.

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