Question

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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

Answer 1

@mathmate

Answer 2

This is a lot going on here. First you need to figure out the circumference of the tire. If it has a diameter of 2 ft, the circumference is C=pi * d, which is C = 6.283. That is how many feet, then, that tire will cover in 1 revolution. It covers 13 revolutions in 1 sec, so it covers 81.68 feet in one second. Now do the conversions, like this:

Answer 3

Nearest mile is 56, choice B from above.

Answer 4

thank you sooooo much