Help with a particular way with formulae

I am drawing up a schedule for my college. I would like to insert formulae into the schedule so that I don't have to keep entering data.
So, how can I insert the timings of a particular course into one field and get it to show the number of hours in another field beside it. In this case for a whole column labelled course timings and number of hours respectively.
For example: 2.30pm-4.30pm. How do I get the result of 2 hours in another field by just entering this data?

goozin wrote:
I am drawing up a schedule for my college. I would like to insert formulae into the schedule so that I don't have to keep entering data.
So, how can I insert the timings of a particular course into one field and get it to show the number of hours in another field beside it. In this case for a whole column labelled course timings and number of hours respectively.
For example: 2.30pm-4.30pm. How do I get the result of 2 hours in another field by just entering this data?
Why not read the "iWork Formulas and Functions User Guide" available to every user from the Help menu ?
If the starting time is in B2, the ending time is in C2
enter =C-B in D2
Yvan KOENIG (from FRANCE mercredi 5 août 2009 12:05:37)

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