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| Q.27 | Pipes A and B can fill an empty tank in 10 hours and x hours, respectively. Pipe C alone can empty a full tank In 9 hours. When all three pipes are opened together, the tank is filled up completely in 18 hours. What is the value of x? | |
| Ans | 1. 20 | |
| 2. 15 | ||
| 3. 18 | ||
| 4. 12 |
Correct Ans: 2
