SOLUTION: A 831-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 109 mph. For the remainder of the trip, the average speed was 126 mph.

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Question 1196949: A 831-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 109 mph. For the remainder of the trip, the average speed was 126 mph. How long did the plane fly at each speed?
109 mph hr
126 mph hr
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A 831-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 109 mph. For the remainder of the trip, the average speed was 126 mph. How long did the plane fly at each speed?
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t = time at 109
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109t + 126*(7-t) = 831
Solve for t, etc