Two piped A & B can fill a tank in 36 hrs and 45 hrs respectively. If – McqOptions

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1.	Two piped A & B can fill a tank in 36 hrs and 45 hrs respectively. If both pipes are opened simultaneously, how much time will be taken to fill the tank?
A.	20 hrs
B.	21 hrs
C.	22 hrs
D.	None
Answer» B. 21 hrs

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