Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

Taps U and V can fill a vessel in 24 minutes and 30 minutes respectively. If both are opened simultaneously and U is closed after 6 minutes, then how long would it take for V to fill the vessel?

Q. Pipe X and Y take 60 minutes and 90 minutes respectively to fill a cistern. Pipe Z can empty a cistern in 60 minutes. Pipe X and Y are opened when the tank is empty. Pipe Z is opened by an attender when the tank is half full. However, one rainy day, the attender comes late and delays the opening of the Pipe Z by 9 minutes. What is the time difference of the tank overflow on that day as compared to the other days?

Q. Two pipes A and B can fill a cistern in

37 \frac{1}{2}

minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:

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Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

The correct option is D 14 min. 40 sec.Part filled in 4 minutes =4(115+120)=715.Remaining part=(1−715)=815.Part filled by B in 1 minute =120∴120:815::1:xx=(815×1×20)=1023min=10 min. 40 sec.∴ The tank will be full in (4 min. +10 min. +40 sec.)=14min. 40sec.

Two pipes A and B can fill a tank in $15$ minutes and $20$ minutes respectively. Both the pipes are opened together but after $4$ minutes, pipe A is turned off. What is the total time required to fill the tank?