A Jet Plane Traveling at a Constant Speed Goes 1300 $50 \mathrm{mph}$

Multiple Choice

A jet plane traveling at a constant speed goes 1300 miles with the wind, then turns around and travels for 1100 miles against the wind. If the speed of the wind is $50 \mathrm{mph}$ and the total flight took 4 hours, find the speed of the plane in still air.

A) $575 \mathrm{mph}$
B) $600 \mathrm{mph}$
C) $485 \mathrm{mph}$
D) $655 \mathrm{mph}$