Question

Three pipes A, B and C can fill a tank in t, (t+12) & (t-12) hours respectively. Pipe A opened for d hours in the tank and after that B and C also opened in the tank, while all three pipes opened for (d+6) hours and after that pipes A and C closed. If the remaining tank filled by pipe B in (d+2) hours and tank filled by pipe A in three hours equal to tank filled by B in four hours, then find in (t+3d) hours what portion of tank will be filled by pipe
B. 

A 14/15
B 15/16
C 5/6
D 3/4
E Can’t determined
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