adding to fields together

I have this part of code with provides hrs and minutes for two columns

but i now need to add another colunm which is the total of the two fields

so today i have
hrmins      bHrMin
6:45              0:30
0:45              0:00
6:00              0:30
5:00              0:30

i would like

hrmins      bHrMin   TotalMins
6:45              0:30         6:15
0:45              0:00         0.45
6:00              0:30         5.30
5:00              0:30         4.30
FLOOR((charge_split_1.duration + 1) / 60.0)) + ':' + RIGHT('0' + CONVERT(varchar, (charge_split_1.duration + 1) % 60), 2) AS hrmins, CONVERT(varchar, 
                      FLOOR(charge_split_1.break_time / 60.0)) + ':' + RIGHT('0' + CONVERT(varchar, charge_split_1.break_time % 60), 2) AS bHrMin,

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James MurrellProduct SpecialistAsked:
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James MurrellProduct SpecialistAuthor Commented:
went a bit brain dead, answer was simple

(charge_split_1.duration + 1- charge_split_1.break_time)/60.0 as  newtotal

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James MurrellProduct SpecialistAuthor Commented:
solution provided
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