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Two pipes can fill a tank in 15 hours and 20 hours respectively, while the third can empty it in 30 hours. If all the pipes are opened simultaneously, the empty tank will be filled in
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- 10 hours
- 12 hours
- 15 hours
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15 1 hours 2
- 10 hours
Correct Option: B
On the basis of given details in question ,
When all three pipes are opened simultaneously :
| Part of tank filled in 1 hour = | + | - | |||
| 15 | 20 | 30 |
| Part of tank filled in 1 hour = | = | = | |||
| 60 | 60 | 12 |
Hence, the tank will be filled in 12 hours.
