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Two planes leave from Atlanta, Georgia. One makes a 5.3 hr flight to Seattle, Washington, and the other makes a 4 hr flight to

Two planes leave from Atlanta, Georgia. One makes a 5.3 hr flight to Seattle, Washington, and the other makes a 4 hr flight to Boston, Massachusetts. The plane to Boston averages 56 mph slower than the plane to Seattle. If the total distance traveled by both planes is 3124 mi, determine the average speed of each plane.

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