A boat is sent across a river with a velocity of 8 km/hr. If the resultant velocity of boat is 10 km/hr,then velocity of the river is :

10 km/hr

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8 km/hr

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6 km/hr

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4 km/hr

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Solution

The correct option is C 6 km/hr

Given $\to A B$ = velocity of boat = 8 km/hr
AC = Resultant velocity of boat = 10 km/hr
$\to B C$ = Velocity of river = $\sqrt{A C^{2} - A B^{2}}$
$= \sqrt{(10)^{2} - (8)^{2}} = 6 k m / h r .$

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A boat is sent across a river with a velocity of 8 km/hr. If the resultant velocity of boat is 10 km/hr,then velocity of the river is :

The correct option is C 6 km/hr Given →AB = velocity of boat = 8 km/hr AC = Resultant velocity of boat = 10 km/hr →BC = Velocity of river = √AC2−AB2 = √(10)2−(8)2=6 km/hr.

The correct option is C 6 km/hr

Given $\to A B$ = velocity of boat = 8 km/hr
AC = Resultant velocity of boat = 10 km/hr
$\to B C$ = Velocity of river = $\sqrt{A C^{2} - A B^{2}}$
$= \sqrt{(10)^{2} - (8)^{2}} = 6 k m / h r .$