Time to Seconds Conversion

Hi All Power BI Gurus,

I need help in calculating the difference in times in MM:SS format. I have two columns with times (Time1 and Time2) and I want the difference these two times in a new column (Time Diff). I'm very new to power BI and I'm learning dashboard. Please help me with this formating issue as well. I tried duration.totext and also DATEDIFF but I didn't get any results, it was giving me some syntax error. 

Time1      Time2        Time Diff
1:20:05    1:30:05       10:00
13:10:00  13:20:50     10:30

Thank you,

M