An outlet pipe can empty a cistern in 30 min, then what

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An outlet pipe can empty a cistern in 30 min, then what part of the cistern will it empty in 1 min ?

1. 1/20
2. 1/15
3. 1/30
4. 1/18

Correct Option: C

We know that, when a pipe empties a cistern in n min, then the part emptied by the pipe in 1 min = 1/n

Here, n=30
∴ Required part of the tank emptied in 1 min = 1/30 part