Solve the problem.
-An airplane flies 450 miles with the wind and 330 against the wind in the same length of time. If the speed of the wind is 20, what is the speed of the airplane in still air?
A)120 mph
B)55 mph
C)130 mph
D)135 mph

Question

Quizplus · Accepted Answer

The speed of the airplane in still air is calculated by setting up the equation for time: time = distance/speed. With the wind, the speed is (x + 20) and against the wind, it is (x - 20). Since the times are equal, 450/(x + 20) = 330/(x - 20). Solving this equation gives x = 130 mph.

Solve the Problem. -An Airplane Flies 450 Miles with the Wind and 330