Mathematics, 07.10.2020 19:01, ratpizza

A 816-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, average speed was 111 mph. For the remainder of the trip, the average speed was 124 mph. How long did the plane fly at each speed?

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A 816-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, average speed...

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