Choose the one alternative that best completes the statement or answers the question.

Solve the problem.
-A plane flies 500 mi with the wind and 300 mi against the wind in the same length of time. If the speed of the wind is 27 mph, what is the speed of the plane in still air?
A) 133 mph
B) 108 mph
C) 113 mph
D) 98 mph

Question

Choose the one alternative that best completes the statement or answers the question. 
 
Solve the problem.
-A plane flies 500 mi with the wind and 300 mi against the wind in the same length of time. If the speed of the wind is 27 mph, what is the speed of the plane in still air?
A) 133 mph
B) 108 mph
C) 113 mph
D) 98 mph

Quizplus · Accepted Answer

The plane's speed in still air is 108 mph. With the wind, the effective speed is 108 + 27 = 135 mph, and against the wind, it is 108 - 27 = 81 mph. The time for both trips is the same: 500/135 = 300/81. Solving this equation confirms the plane's speed in still air is 108 mph.

Choose the One Alternative That Best Completes the Statement or Answers