Calculate time difference in a query

Hi all,

I am wanting to calculate the difference between two times in a query. Here is what I have:

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So, for example if I have 2:36pm as the timestrt and 6:01pm as timeend, but it's showing 205.00, I want to see 3:25 as the result
How do I change the expression to show this?

The "n" means you are returning the answer in minutes. If you want h:mm, I wouldn't even bother with DateDiff.

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Thanks for the correction to my query expression, this works just as wanted within the query.
But, I get an error on my report with the same formula which feeds from the query saying "This expression is typed incorrectly". Do need a different expression to sum all the time differences within my report?
Thanks