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A river is flowing steradily with a spee...

A river is flowing steradily with a speed ` 5 km h^(-1)` . A boat man can row with a speed of ` 10 km h^(-1)` in still water. He rows his boat in river at right angles to the bank of river, If width of river is ` 800 m`, (i) how much time the boat man will take to cross the river ? (ii) How far away from a point just opposite to the bank of river he will be reaching there ? (ii) What will be his effective speed gt

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