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A man is standing on a straight bridge o...

A man is standing on a straight bridge over a river and another man on a boat is on the river just below lthe man on the bridge. If the first man starts walking at the uniform speed of 4 m/ min and the boat moves perpendicularly to the bridge at the speed of 5 m/min then at what rate are they separating after 4 minutes if the height of the bridge above the boat is 3 m?

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