A boat is sent across (perpendicularly) w.r.t. to the river flow with a velocity of 12kmh−1. If the resultant velocity of the boat is 13kmh−1, the river is flowing with a velocity of
A
12kmh−1
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B
13kmh−1
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C
5kmh−1
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D
None of the above
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Solution
The correct option is C5kmh−1 Let the velocity of the river be v.