a boat which has a speed of 5 km per hour in still water crosses a river of width 1km along the shortest possible path in fifteen mins. the velocity of the river water in km per hour is
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148
Answer:3
Explanation: t=15/60
Resultant velocity of river=width of river ÷time
=1÷15/60
=4km/h
Useing Triangle law:-
Bc^2 = 5^2-4^2
=25-16
=9
Bc =3
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