Two valves P 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:

Two valves P 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:
1). 5 min
2). 6 min
3). 9 min
4). 10 min

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