SOLUTION: A 810-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 111 mph. For the remainder of the trip, the average speed was 122 mph.

Algebra ->  Equations -> SOLUTION: A 810-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 111 mph. For the remainder of the trip, the average speed was 122 mph.      Log On


   

Question 1196978: A 810-mile, 7-hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 111 mph. For the remainder of the trip, the average speed was 122 mph. How long (in hours) did the plane fly at each speed?

111 mph______hr
122 mph_________ hr

Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.

t = time at 111 mph.

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111t + 121*(7-t) = 810

Solve for t, etc.