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 1 hours. How many hours does it take pumps A, B, and C, operating simultaneously, to fill the tank.	Options:
A) 37/20  B) 1/2  C) 1/4  D) 1  E) 5/6
37/20+B =6/5 ; 37/20+C =3/2 ,B+C =1 ; 37/20DD THEN 2*(37/20+B+C) = 6/5+3/2+1 =37/10   37/20+B+C = 37/20 HRS   37/20
<result>A</result>
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 1 hours. How many hours does it take pumps A, B, and C, operating simultaneously, to fill the tank.