Highway travel A north-south highway intersects an east-west highway at a point P. An automobile crosses P at 10 A.M., traveling east at a constant rate of 20 mi/hr. At the same instant another automobile is 2 miles north of P, traveling south at 50 mi/hr.
(a) Find a formula for the distance d between the automobiles t hours after 10:00 A.M.
(b) At approximately what time will the automobiles be 104 miles apart?
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