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20 December, 15:02

A tire on Sal's car makes 13 revolutions per second while traveling down the freeway. Sal's tires are 2 ft in diameter, and there are 5,280 feet in 1 mile. How far does Sal drive in 1 hour? Round the answer to the nearest mile.

A. 28 miles

B. 56 miles

C. 60 miles

D. 111 miles

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  1. 20 December, 15:05
    0
    A single revolution is equal to the circumference of the tire which is equal to:

    C=2pr and r here is just 1 so C=2p ...

    (13rev/s) (2pft/rev) (3600s/hr) (mi/5280ft) = 55.69mi which is

    56mi (rounded to nearest mile)
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