Solve the Problem $47\mathrm { mi }$ B) $36 \mathrm { mi }$

Solve the problem.
-Mary is in a boat in the ocean 48 mi from point A, the closest point along a straight shoreline. She needs to dock the boat at a marina x miles farther up the coast, and then drive along the coast to
Point B, 96 mi from point A. Her boat travels 10 mph, and she drives 60 mph. If the total trip took 7
Hr, determine the distance x along the shoreline.

A) $47\mathrm { mi }$
B) $36 \mathrm { mi }$
C) $32 \mathrm { mi }$
D) $43 \mathrm { mi }$