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A pilot flies 630 miles with a tailwind of 35 miles per hour. Against the wind, he flies only 455 miles in the same amount of time. Find the rate of the plane in still air.

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Answer:

Explanation:

630/n+35=455/n-35

630n-22050=455n+15925

175n=37975

n=217

The plane goes 217 mph in still air..

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