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A boat which has a speed of 5km/hr in still water crosses a river of width 1km along the shortest possible path in 15 minutes. The velocity of the river water in km/hr is ?

6 years ago

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Answers : (4)

										

the velocity of the river is 3 km /h

6 years ago
										

please explain how idont want the answer but how the answer comes?

6 years ago
										

let the velocity of the river be x. the velocity of the river will be in the horizontal direction


velocity of boat in still water is 5km/hr. As the width of the river is 1 km and time taken by the boat to cross the river along the shortest path is 15 min therefore the velocity of the boat is=  1*60/15= 4km/hr


 according to the figure the velocity of the river is along  AB . By applying triangle law of vector addition the value of AB comes to be 3km/hr


1590_22392_line.jpg

6 years ago
										
how the boat go in the direction CA and river in AB pls explain the direction of river and moving boat
 
23 days ago

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