Solve the problem.A plane flies 500 miles with the wind and 300 miles against the wind in the same length of time. If the speed of the wind is 21 mph, what is the speed of the plane in still air?

A. 74 mph
B. 89 mph
C. 84 mph
D. 109 mph

Answer: C

Mathematics

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A.
B. ?
C. ?
D. ?
E. ?

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