SOLUTION: An airplane flew for 6 hours at a speed of 455 miles per hour and then for 5 more hours at a speed of x miles per hour. The average speed of the airplane was 495 miles per hour.

Question 428027: An airplane flew for 6 hours at a speed of 455 miles per hour and then
for 5 more hours at a speed of x miles per hour. The average speed of
the airplane was 495 miles per hour. Write an equation that could be
used to find x.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
6 hours at 455 mph = 2730 miles
5 hours at x mph distance = 5x
..
Total distance = 5x+2730
Total time = 11 hours
Average speed = (5x+2730)/11 mph
495 = (5x+2730)/11
495*11= 5x+2730
5x=5445-2730
5x=2715
x=543
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