Pipes & Cisterns Mcqs


Q.  A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full the leak will empty it in.

a. 16 hrs
b. 20 hrs
c. 25 hrs
d. 40 hrs


ANSWER: See Answer
 
Work done by leak in 1 hour = (1/8 – 1/10) = 1/40

The leak will empty the cistern in 40 hours.
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