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Mathematics 9 Online
OpenStudy (anonymous):

An airplane flew in a straight line into a headwind for 6 hours, covering 2,550 miles. It then flew in the exact opposite direction (with the headwind now a tailwind behind it) at the same engine speed for 3 hours, traveling an additional 1,725 miles. How fast would the plane have been flying (in mph) if there was no wind? A. 75 mph B. 425 mph C. 500 mph D. 575 mph

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