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@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.
Vr is velocity of river. Vs is velocity of swimmer . i figured velocity perpendicular to AC should be zero.
if Vs acts at some random angle alpha then Vsr ( Vel of swimmer wrt r ) = Vs cosalpha , the velocity which drives the swimmer along that line
therefore Vssinalpha = Vrcostheta
+solved @vj25_
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