Solve the Problem $30 \mathrm{mph}$ , What Is the Speed of the Plane in Still

Multiple Choice

Solve the problem.
-A plane flies 460 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is $30 \mathrm{mph}$ , what is the speed of the plane in still air?

A) $225 \mathrm{mph}$
B) $205 \mathrm{mph}$
C) $200 \mathrm{mph}$
D) $190 \mathrm{mph}$