Formula IF contains certain text, then will add time to another [Closed]

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Thursday December 21, 2017
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January 4, 2018
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Hello,
A1 is original time, B1 will be a type of equipment, C1 will be 40, 45 or 55 minutes, depending on types on B1, D1 will add C1 and A1 and throw a sum result of those.
I tried =IF(B1="319",+"0:40")*IF(B1="320",+"0:45")*IF(B1="321",+"0:55") And then D1=A1+C1 but all I get is zeros and no addition is made.