Pipes A and B can fill a water tank in 30 and 45 minutes respectively while pipe C can take out all the water in 60 minutes. If the three pipes are opened simultaneously, how long it would take to fill the empty tank?

\(\left( {25\; + \;\frac{5}{7}} \right)\)min

\(\;34\; + \;\frac{1}{2}\;\)min

\(\left( {18\; + \;\frac{5}{7}} \right)\;\)min

Pipes A and B can fill a water tank in 30 and 45 minutes respectively

1.	Pipes A and B can fill a water tank in 30 and 45 minutes respectively while pipe C can take out all the water in 60 minutes. If the three pipes are opened simultaneously, how long it would take to fill the empty tank?
A.	\(\left( {25\; + \;\frac{5}{7}} \right)\)min
B.	60 min
C.	\(\;34\; + \;\frac{1}{2}\;\)min
D.	\(\left( {18\; + \;\frac{5}{7}} \right)\;\)min
Answer» B. 60 min

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Pipes A and B can fill a water tank in 30 and 45 minutes respectively while pipe C can take out all the water in 60 minutes. If the three pipes are opened simultaneously, how long it would take to fill the empty tank?

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