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Pipe 1 and 2 can fill a tank alone in 6 hours and 9 hours respectively. Pipe 3 can empty the full tank in 18 hours. If all the 3 pipes are opened simultaneously, then how much time is required to fill the tank completely?
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- 2 hours
- 3.6 hours
- 4.5 hours
- cannot be filled
- 2 hours
Correct Option: C
From the given question ,
| Work done in 1 hour by all 3 pipes = | + | - | = | ||||
| 6 | 9 | 18 | 18 |
| ∴ Time required to fill the tank completely = | = 4.5 hours | |
| 4 |
