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

An outlet pipe can empty a cistern in 30 min, then what part of the ci

1.	An outlet pipe can empty a cistern in 30 min, then what part of the cistern will it empty in 1 min ?
A.	1/20
B.	1/15
C.	1/30
D.	1/18
Answer» D. 1/18

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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 ?

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