Display value in hh:mm time format in SSRS Report

Hi Everybody,

I have an SSRS report where one of the column is sum of time values. When I do the summation, the values are coming in this format. In the last column the minute value is getting displayed more than 60. How can I format it to proper time format as hh:mm so that it displays as "08:15" . The expression which I am using is "  Sum(CDec(FormatNumber(Fields!Overtime_Hours.Value,2)),"Month"). Your help would be highly appreciated.

Thanks & Regards,

 RPC

Regards RCP