Time of travel. An island is at point A, 5 mi from the nearest point B on a straight beach...

Time of travel. An island is at point A, 5 mi from the nearest point B on a straight beach. A store is at point C, 8 mi up the beach from point B. Julio can row at 4 mi / hr and walk 5 mi/hr. He rows to the point P, x mi up the beach from point B and walks from P to C. Write the total time T of travel from A to C as a function of x.