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A man can swim at the rate of 5 km h^-1 ...

A man can swim at the rate of `5 km h^-1` in still water. A `1 - km` wide river flows at the rate of `3 km h^-1` The man wishes to swim across the river directly opposite to the starting point.
(a) Along what direction must the man swim ?
(b) What should be his resultant velocity ?
( c) How much time will he take to cross the river ?

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