I created some time conversion formulas, specifically designed for high school boys. Here's a sample. Let me know what you think.
800m 1600m 3200m
1:50 4:08 8:57
1:55 4:19 9:21
2:00 4:30 9:46
2:05 4:41 10:10
2:10 4:53 10:35
2:15 5:04 10:59
2:20 5:15 11:24
2:25 5:26 11:48
2:30 5:48 12:12