1. The problem statement, all variables and given/known data In the picture below. 2. Relevant equations Velocity on a pulley = (velocity on left rope + velocity right rope)/2 Pulley A and C have 0 velocity. 3. The attempt at a solution By inspection the right sided rope on pulley A is 120 mm/s going up. After that is when I get confused. Pulley B and D are in motion, so I don't see what else to do from here.