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Discussion

1) A pipe can empty a cistern in 20 minutes. find the time in which 3/4 part of the cistern will be emptied.

A) 12 min

B) 11 min

C) 16 min

D) 15 min

Suggestion

Explanation:

We have 1/20 part of the cistern emptied in 1 minute
=> 3/4 of the cistern will be emptied in 20 x 3/4 = 15 minutes.

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