SOLUTION: A 692-mile, 6-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 128 mph.

Question 1158479: A 692-mile, 6-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 128 mph. How long did the plane fly at each speed?
Answer by josgarithmetic(39625) (Show Source): You can put this solution on YOUR website!
If x is the time at 109 mph, and 6-x is time at 128 mph, then this equation will give the relationship:

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