Hello my name is Ivan i'm 1. year student of Marine engineering and i have little and simple question to solve.
I have pulley system to solve, can someone help me.
i need to determine the speed of cargo A if the point T moves with the speed vT when the engine M pulls the rope.

Here is the picture of the task and the part that i did.
I just want to know where i made a mistake if i even made one.

http://s23.postimg.org/9yrwuo3t7/1619339_10202272799355964_6340980229781991768_n.jpg