Format expressions(converting seconds to minutes)

can any one tell me how to change seconds to minutes by using if condition in rss...

for example i have value of seconds=50, minutes should come like this 50/60=0.833333.... i got the answer ... but the problem is how to roundoff or truncate the minutes to 0.83 or 0.84 from 0.8333333...

Thanks in anticipation

raj

using this expression i have got it ....

=iif( Fields!duration.Value=0,0,format(Fields!duration.Value/60,"0.00"))