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-A twin-engined aircraft can fly 1600 miles from city A to city B in 5 hours with the wind and make the return trip in 8 hours against the wind. What is the speed of the wind?
A) 80 mph
B) 40 mph
C) 100 mph
D) 60 mph

Question

Quizplus · Accepted Answer

The speed of the plane in still air is the average of the speeds with and against the wind: (1600/5 + 1600/8)/2 = 200 mph. The speed with the wind is 320 mph (1600/5), and against the wind is 200 mph (1600/8). The wind speed is the difference between the plane's speed with the wind and in still air: 320 - 200 = 60 mph.

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