How do i change the result of a formula into normal text ? [Closed]

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Thursday January 23, 2014
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October 10, 2014
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Hello ,
i have a formula which calculates my working hours for each day " =C9+(B9>C9)-B9 " ... when i try to sum all the hours resulted from that formula it gives me some other numbers ...
is there a way to change the result of that formula into text so i can sum it or is there a way to calculate it directly ?