Solution:
Distance travelled in y-direction = 400 m
Time to cross = 100 sec
So, Speed in y-direction = 4 m/s
Speed in x-direction = 3m/s
So, angle = 90 +37 =127º
A man wishes to swim across a river 400 m wide flowing with a speed of 3m/s, such that he reaches the point just in front on the other bank in time not greater than 100 sec. The angle made by the direction he swims and river flow direction is :
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