Hey guys I have a problem

I download call information into excel to make pivot reports.

One of the fields is call duration. The format of the information is
Minutes:seconds
i.e. the call lasted 5:35 = 5 minutes and 35 seconds. Excel understand this
as 5:35AM. This becomes even more problematic when I try and calculate total
minutes, as excel sees it as 5:35AM + 12:02PM ....

How can I make excel see this information as minutes and seconds and not
"time"
I've tried to convert the cells into text but all that does is give me the
excel code version of time.

This is an example of a line
Date Time Origin Destination Duration
10-Sep 14:53 *** *** 08:51 ------- 8:51:00AM


Thank you
Josh