Two valves A and B can fill a sump in \(37\frac{1}{2}\) minutes and 4 – McqOptions

MCQOPTIONS

1.	Two valves A and B can fill a sump in \(37\frac{1}{2}\) minutes and 45 minutes respectively. Both valves are opened. The sump will be filled in just 30 minutes, if valve B is turned off after?
A.	5 min
B.	6 min
C.	9 min
D.	10 min
Answer» D. 10 min

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