Set up the equations for 3.9 WebAssign Homework (SCalcET8 3.9.019). A man starts walking north at 6 ft/s from a point P. Five minutes later a woman starts walking south at 7 ft/s from a point 500 ft due east of P. At what rate are the people moving apart 15 min after the woman starts walking? (Round your answer to two decimal places.)