Question: Two pulleys of masses 12 kg and 8 kg are connected by a fine string hanging over a fixed pulley as shown. Over the 8 kg pulley is hung a fine string with masses 4 kg and M. Over the 12 kg pulley is hung another fine string with masses 3 kg and 6 kg. Calculate M so that the string over the fixed pulley remains stationary. Problem: The question places no demands on how long the setup must remain stationary. In time, it will snap out of equilibrium, i.e., when the heavier of the two masses in the two two-mass-string sub-system falls to one side, the 12 kg and 8 kg masses are all that will remain. And then that two will collapse to one side. So the question demands me to comment on the very brief period of time for which the system will be in equilibrium. This lack of explicit time-bound requirement on the solution discouraged me to proceed with the solution for a very long time. Can we all agree that the question could be clearer in its wordings? Or is the information sufficient for some of you? Would appreciate all thoughts. Best regards, wirefree P.S. I don't seek the solution to the question.