Question

a pipe can fill a cistern in 9 hrs due to leak in its bottom the cistern fills up in 10 hours if the cistern is full in how much time will it be emptied by the leak
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Answer 1

Answer:

A leaked pipe fills less part of cistern in 1 hour as compared to good pipe.so, we can get time in which cistern will be emptied by leaked pipe by the reciprocal of their difference. Therefore, Time take by leaked pipe to empty the full cistern=90 hrs.