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A river flows at a speed of  2 m/s. A person navigates at a speed of 10 m/s relative to a river in a direction perpendicular to the river. If the width of the river is 400 meters, how far is it directly in front of the starting point when it reaches the other bank?

Option: 1

75 meter

Option: 2

82 meter

Option: 3

80 meter


Option: 4

64 meter

Answers (1)


Given that :

River width, RW=400\ m

Swimming speed, SS=10\frac{m}{s}


River crossing time =\frac{Distance}{Speed}

                                 =\frac{400}{10}=40\ seconds

Horizontal displacement caused by river speed = speed × time                                                           =40\times 2=80\ metres                                 

Posted by

Ritika Jonwal

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