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(40" yd")/(4.5" sec")*(3" ft")/(1" yd")*...

`(40" yd")/(4.5" sec")*(3" ft")/(1" yd")*(5,280" ft")/(1" mi")*(60" sec")/(1" min")*(60" min")/(1" hr")`
A sprinter who can run the 40-yard dach in 4.5 seconds converts his speed into miles per hour, using the product abov. Which fraction in the product is incorrectly written to convert his speed?

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