Question : There are 3 taps, A, B, and C, in a tank. These can fill the tank in 10 h, 20 h, and 25 h, respectively. At first, all three taps are opened simultaneously. After 2 h, tap C is closed, and taps A and B keep running. After 4 h, tap B is also closed. The remaining tank is filled by tap A alone. Find the percentage of work done by tap A itself.

Option 1: 75%

Option 2: 52%

Option 3: 72%

Option 4: 32%

Question : Directions: A tap can fill up a tank of 1250 litres in 4 hours, whereas another tap can fill the same tank in 8 hours. An outlet tap can empty that tank in 6 hours. If all three taps are opened simultaneously, then how much time will it take to fill the tank?

Option 1: 4.2 Hours

Option 2: 5 Hours

Option 3: 4.5 Hours

Option 4: 4.8 Hours

Question : Taps A and B can fill a tank in 15 minutes and 10 minutes, respectively while tap C can empty the full tank in x minutes. If all three taps are opened together, the tank is filled completely in 8 minutes. Tap C alone will empty $\frac{3}{8}$ th part of the tank in:

Option 1: 10 minutes

Option 2: $10 \frac{1}{2}$ minutes

Option 3: 9 minutes

Option 4: $8 \frac{1}{2}$ minutes

Question : Pipes A, B and C can fill a tank in 10, 15 and 30 hours, respectively. D is an emptying pipe which alone can empty the full tank in $x$ hours. A, B and C are opened together for 3 hours and then closed. Now D is opened which alone empties the tank in 30 hours. What is the value of $x$?

Option 1: 50

Option 2: 40

Option 3: 60

Option 4: 45

Question : Pipes P and Q can fill a tank in 10 and 12 hours respectively and C can empty it in 6 hours. If all three are opened at 7 AM at what time will one-fourth of the tank be filled?

Option 1: 10 AM

Option 2: 10 PM

Option 3: 11 PM

Option 4: 11 AM