How can I return my value in minutes and seconds?

I'm trying to pull the average length of call.

The source sheet is formatted in minutes and seconds:

I'm getting a #DIVIDE BY ZERO error when I apply =AVG. This is caused by the formatting of the values, right? Should I convert the length of call to minutes only before applying the formula? Or is there a solution to use within the formula?

Any input is greatly appreciated!


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