Solving a problem in physics section 21 point 48 mechan

Solving a problem in physics section 21 point 48 mechan

Two flywheel 48 in the form of disks of the same radii and masses are unwound to the speed of rotation of 480 rev / min and left to themselves. Under the action of the friction forces on the shaft bearings through the first stop 80, and the second made 240 rpm to a stop. Which flywheel friction torque on the shaft bearings has been more and how many times?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)