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A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much as that of the first is also attached with the tank to empty it. The two together can empty the tank in :
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- 8 minutes
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13 1 minutes 3
- 30 minutes
- 38 minutes
- 8 minutes
Correct Option: A
As per the given in question ,
Here, the diameter of the second pipe is twice that of first pipe.
∴ Volume of water emptied by the second pipe will be 4 times to that of first pipe.
Hence, time taken will be 1/4 of the first pipe.
| ∴ Second pipe will empty the tank in | × 40 = 10 minutes | |
| 4 |
When both the pipes are open, the part of the tank emptied in
| 1 minute = | + | = | = | ||||
| 40 | 10 | 40 | 8 |
Hence, the tank will be emptied in 8 minutes.
