Three crates with various contents are being pulled by a 3575-N force across a conveyor system

Three crates with various contents are being pulled by a 3575-N force across a horizontal, frictionless roller-conveyor system. The group of boxes is accelerating on the conveyor at 1.578 m/s2 to the right. Between each adjacent pair of boxes is a force meter that measures the magnitude of the tension in the connecting rope. Assume that the ropes and force meters are massless. What is the total mass of the three boxes? What is the mass of each box?