IIT JEE , AIEEE Forum - Physics , Mechanics

INDIAN_ARMY19890

WHEN WATER IS NOT FLOWING
let speed of boat=V speed of flow=0
let width of river=d
total time taken= d/V
WHEN WATER IS FLOWING WITH VELOCITY U
time taken to cross the river =d/Vcos$
where $ is the angle which V makes with vertical direction i e with perpendicular direction to tht of flow of water
this situation shouid satisfy for $
Vsin$=U so sin$=U/V
total time taken during still day=2d/V
total time taken during rough day= 2d/Vcos$ obviously 2nd 1 is gr8ter then first hence answer is 1

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