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The force required to tow boat at a cons...

The force required to tow boat at a constant velocity is proportional to the velocity. If it takes 7460 W to two a certain boat at a speed of 4 kmph, how much horse power (1 H.P = 746 watts) will be required to tow it at a speed of 12 kmph ?
[Hint : Force `prop` velocity P = force `xx` velocity]

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