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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 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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mccurleya12345oyft0y

Answer:4 hours at 126 mi/hr

t = time flying at 111 mi/hr

837 = 111t + 126*(7-t)

837 = 111t + 882-126t

-45 = -15t

t = 3 hours at 111 mi/hr

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