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Pumps A, B and C operate at their respective constant rates. Pumps A and B, operating simultaneously, can fill a certain tank in 6/5 hours; pumps A and C, operating simultaneously, can fill the tank in 3/2 hours; and pumps B and C, operating simultaneously, can fill the tank in two hours. How many hours does it take A, B, and C operating simultaneousely to fill the tank a. 1/3 b. 1/2 c. 2/3 d. 5/6 e. 1 Ans : 1