Formula to add minutes to a timestamp

[wjmj]

Hello I have cell A1 with a time stamp (12:05:39). Cell B1 has a number 3.9. I would like C1 to be - (B1) 3.9 minutes added to the cell A1 timestamp.
Thanks in advance!

[6StringJazzer]

Try:

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[wjmj]

Thats the answer. Thanks for the help @6StringJazzer

[6StringJazzer]

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