The distance he rides is, 44 1/2 miles long, he rides a portion of the distance at a slow speed both to warm up and to cool down, Ryan rides 4/5 of the distance at a fast speed for training, of the slow-speed portion, 1/3 is for the warm-up.
Which estimate is closest to the distance, in miles, Ryan rides to cool down?
A. 3
B. 6
C. 9
D. 12
