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A man can swim at a speed of 5km//h in t...

A man can swim at a speed of `5km//h` in the still water. He wants to cross a `1600m` wide river flowing at `4 km//h`. He keeps himself at an angle `127^(@)` with the river flow while swimming. (a) Find the time he takes to cross the river. (b) Find the distance traveled by him along the flow.

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