Question 428027
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