So 1 hour=60 min.,
So 10/1*60/1=600 min. That means 10 hours = 600 min.,
Then add the 39 min. to this equation= 639 min.,
Then you solve for the seconds, 24/1*1/60=0.4,
So 24 seconds is 0.4 (40%) of a minute,
Then it mean that it would take 639.4 minutes for Saturn to make a full rotation.
Hope This helps!!!
<3 -austint1414