Kira skied at a steady speed in a 2-mile cross-country ski race. Her finish time was 5/12 hour. The fraction 2/5/12 (2 over 5/12) represents Kira's speed in miles per hour.

Which division expression represents Kira's speed in miles per hour?
1/2 (divided by) 5/12
5/12 (divided by) 1/2
5/12 (divided by) 2
2 (divided by) 5/12