Wendy keeps her hamster, Fluffy, in a cage shaped like a rectangular prism that is 20 inches long, 14 inches wide,
and has a volume of 4,340 cubic inches. Kenneth keeps his hamster, Speedy, in a cage that is the same length, but
is 15 inches wide and has a volume of 5,250 cubic inches.
How much taller is Speedy's cage than Fluffy's cage?