To find this answer, just divide 360 by 5 to find out how many times his heart beats in one minute instead of 5. Doing this will give you a final answer of 72 bpm.
So what you would do is divide 37 minutes by 5 to get 7.4 minutes
answer: 7.4 minutes
25.59- 9.99= 15.60
15.60/ 0.05 = 312
312 minutes this month