OT: How to convert an open office cell HH:MM to a numeric value?

[Josef Lowder]

How can I convert an open office cell containing a time value (HH:MM) to a
numeric value?

I've searched the 'net for a couple hours and can't find an answer.

The hours worked was easy =B1-A1 but multiplying that result times a pay
rate of $12 doesn't work.
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