You have 4 machines which make a product as indicated by the progress bar reaching 100%. After the product is made, the bar will return to 0% about a second after reaching completion. The 4 machines started at a different percentage of completion - 5% for A, 20% for B, 66% for C, and 49% for D. All of the machines make about 1% of progress per second.

Every 12 minutes, the machines use up their internal battery, causing rates to drop to +1% every minute for machines C and D. LIkewise, this happens to machine B every 30 minutes. After one minutes is over, rates return to normal.

Question

You have 4 machines which make a product as indicated by the progress bar reaching 100%.  After the product is made, the bar will return to 0% about a second after reaching completion.  The 4 machines started at a different percentage of completion - 5% for A, 20% for B, 66% for C, and 49% for D.  All of the machines make about 1% of progress per second.

Every 12 minutes, the machines use up their internal battery, causing rates to drop to +1% every minute for machines C and D.  LIkewise, this happens to machine B every 30 minutes.  After one minutes is over, rates return to normal.

anonymous · Answer

How long until all of the machines are at the same progress percentage for the first time?
At that time, how much product is made?

anonymous · Answer

@nikato 
@zepdrix