LibreOffice Calc convert hours and minutes into decimal fraction without roll-over

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I have a summed column of time values formatted as HH:MM. The summation is formatted as [HH]:MM which prevents the roll-over when HH > 23. I would like this value to be converted into a decimal number representation. For example:

       A        B
 1   12:25
 2   11:25
 3   03:25
 4   
 5   27:15    27.25

A5 is formatted as [HH]:MM and B5 contains '=A5' formatted as 0.00. However, this produces a mod 24 result of 3.25 instead of 27.25. I cannot seem to find any way of formatting the cell B5 to show the actual decimal hours equivalent of A5.

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