Three pipes A, B, and C can fill a tank in 20, 15, and 30 hrs respecti – McqOptions

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1.	Three pipes A, B, and C can fill a tank in 20, 15, and 30 hrs respectively. If all the pipes are open at the same time, then what is the time taken to fill the tank?
A.	6.67 hrs
B.	15 hrs
C.	10 hrs
D.	5 hrs
Answer» B. 15 hrs

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