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A man starts walking north at 4 ft/s from a point P. Five min-utes later a woman starts walking south at 5 ft/s from a

A man starts walking north at 4 ft/s from a point P. Five min-utes later a woman starts walking south at 5 ft/s from a point500 ft due east of P. At what rate are the people moving apart15 min after the woman starts walking?

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