11.30am to 2pm is 2 1/2 hours.
It is sometimes easier to break it down into two questions. How long until midday? Here it is 1/2 hour to midday. Then how long until 2pm? It is 2 hours. The total is therefore 1/2 + 2 = 2 1/2 hours.
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The elapsed time between 4:00 and 1:30 is 9 and 1/2 hours.
2 hours and 51 minutes. lol
6 and 1/2 hours
2 hours, 22 minutes.
(2:44+24k) hours where k is an integer.