Question

Marc commutes to work on his bicycle, which has tires that measure 26 inches in diameter. A device on his bike informs him that one tire completed 388 full rotations between the time he left his house and the time he arrived at work. Rounded to the nearest inch, how far did Marc bike between his house and work?

Answer 1

Answer: C. 31,692 in.

Explanation:

Just did it on edge! :)

Answer 2

1. The radius of each tire is 26/2=13 in.

2. In one rotation, the tire covers a distance equal to its circumference =
`2 \pi r=2*3.14*13=81.64` in

3. So 388 full rotations mean 388*81.64=31676 in.

4. The distance from Marc's house to his work is 31676 in.