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A motorboat is heading straight across a channel at 8 kph while a tidal current runs at 6 kph at right angles to the motorboat's

A motorboat is heading straight across a channel at 8 kph while a tidal current runs at 6 kph at right angles to the motorboat's direction. The boat ends up 3 km downstream from where it was aiming. How long did it take it to cross the river, and what was its speed across the river bottom?  

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