SOLUTION: A plane flew 480 miles at a certain speed; and then increased its speed by 20 miles per hour, and continued on the same course. After having flown a total distance of 840 miles in
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Question 442892: A plane flew 480 miles at a certain speed; and then increased its speed by 20 miles per hour, and continued on the same course. After having flown a total distance of 840 miles in a total of 5 hours, it landed. What was the original speed of the plane? Answer by rwm(914) (Show Source):
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