Posted by ashley on Wednesday, April 21, 2010 at 9:29pm.
rate = distance / time
= 420/8 = 52.5 mph
so any speed greater than that will give a distance greater than 420
so
rate ≥ 420/8 would do it.
8x ≥ 420
8x/8 ≥ 420/8
x ≥ 52.5
They would need to travel greater than or equal to 52.5 mpg to meet their expectations.
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