7. The velocity of a river current is u. A man crosses the
river with velocity v making an angle 0 with the direc-
tion of the current. If the width of the river is d, find
the time taken to cross the river and the displacement
of the man in the direction of the current. What would
be the minimum time required for crossing the river? In
what time could he reach exactly the opposite point?
[HS '05]
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