Assume that the string does not slip over the pulley

A sack containing sand is tied to one end of a massless inextensible string, the other end of which is connected to a mass M.The string passes over a fixed pulley of mass 2M so that initially the system is balanced.The sack develops a small hole through which the sand leaks out at a constant rate B.Determine the velocity of the sack when one fourth of the sand is left .The mass of empty sack being M/5.Assume that the string does not slip over the pulley.

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