You are on a boat 2 miles from the nearest point on the coast. You plan to travel to point Q, 3 miles down the coast and 1 mile inland. You row at 2 mile per hour and walk at 4 miles per hour.

Write the total time in T(hours) of the trip as a function of the distance x (in miles)

Determine the domain of the function

Find the value of x minimize T.