A Carnot engine (CE-1) works between two temperature reservoirs A and B, where T1=900K and T2=500K. A second Carnot engine (CE-2) works between temperature reservoirs B and C, where T3=300K. In each cycle of CE-1 and CE-2, all the heat rejected by CE-1 to reservoir B is used by CE-2. For one cycle operation, if the net Q absorbed by CE-1 from reservoir A is 150MJ, the net heat rejected to reservoir C by CE-2 (in MJ) is ______________
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