Ryan is training for a bicycle race. ● the distance he rides is miles long. 4 4 2 1 ● he rides a portion of the distance at a slow speed both to warm up and to cool down. ● ryan rides of the distance at a fast speed for training. 5 4 ● of the slow-speed portion, is for the warm-up. 3 1 which estimate is closest to the distance, in miles, ryan rides to cool down? a. 3 b. 6 c. 9 d. 12