What's the elapsed time between 2: 16am and 8: 10pm?

There are several ways in which you could calculate this time period.
One would be to "borrow" in 8:10 p.m."  7:70.

From 7:70 you'd subtract 2:16 pm, obtaining       5:54 (hours)

Last, add 12 hours, since we're going from 2:16 a.m. to 2:16 p.m. (12 hours) and then from 2:16 p.m. to 8:10 p.m. (5:54 hours).  

Total time elapsed:  17:54 (17 hours 54 minutes)



The Europeans have it a bit easier, as they use 24-hour time.

8:10 for them would be 20:10; for the purpose of our problem solving that would be 19:70.  Subtracting 2:16, we'd get 17:54 (17 hours, 54 minutes).

If you make you answer for clear i can answer it : )