How fast is the distance between the cyclists decreasing

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Cyclists A and B approach an intersection, cyclist A from the south at 15 MPH and cyclist B from the west at 20 MPH. If the roads are perpendicular, how fast is the distance between the cyclists decreasing at the moment when cyclist A is 4 miles from the intersection, and cyclist B is 3 miles from the intersection?

304_Cyclists A and B approach an intersection.jpg

Reference no: EM131004206

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