Question

A man can row a boat with speed 4 km/hr in still water. If the velocity of water in river is 3 km/hr. The time taken to reach just opposite end is: (river width = 500 m)

PLEASE ANSWER AS SOON AS POSSIBLE!!!!!

Answer 1

For the boat to cross the river in the shortest time, the man should head the boat in the direction perpendicular to the river current.

Given : Velocity of man wrt river, V

MW

​

=4 km/hr

Velocity of river, V

R

​

=2 km/hr

d=4 km

Minimum time taken to cross the river

t= V MW​

d​ = 44=1 hr