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Set Up an Equation That Can Be Used to Solve

Question 56

Multiple Choice

Set up an equation that can be used to solve the problem. Solve the equation and answer the question asked.
-An airplane flies 480 miles with the wind and 320 against the wind in the same length of time. If the speed of the wind is 20 mph, what is the speed of the airplane in still air?


A) 90 mph
B) 40 mph
C) 100 mph
D) 105 mph

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