Oh, dude, let me grab my calculator... just kidding. So, from 3pm to 4pm, that's one hour. Then from 4pm to 7pm, that's three hours. And finally, from 7pm to 7:30pm, that's half an hour. Add them up, and you get 4.5 hours, which is like 270 minutes. Easy peasy!
9 hours 30 minutes
2 hours and 30 minutes.
18 minutes
733
3 hours.
It is 4 hours.
Assuming you mean on the same day... 5 hours 30 minutes.
3pm to 10pm is 7 hours.
24 of course !
13
three and a half 19:30 - 16:00 = 03:30
3 hours between 12pm and 3pm