Are you sure this is not hours:minutes:seconds? Usually you would have
14:42.0 if this stood for 14 minutes and 42 seconds (with no tenths of
a second), but the way you have typed it it looks like 14 hours and 42
minutes.
If it does stand for hh:mm:ss and you want the number of hours, then
just multiply it by 24 and format the cell as a number with 1 decimal
place. If it stands for mm:ss:tt with hours not displayed, then you
will need to multiply by 24 and by 60 to convert it to decimal
minutes.
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