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1. How much time will the leak take to empty the full cistern? I.  The cistern is normally filled in 9 hours.  II.  It takes one hour more than the usual time to fill the cistern because of la leak in the bottom.






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  • By: guest on 01 Jun 2017 05.47 pm
     I. Time taken to fill the cistern without leak = 9 hours. Part of cistern filled without leak in 1 hour = 1 9 II. Time taken to fill the cistern in presence of leak = 10 hours. Net filling in 1 hour = 1 10 Work done by leak in 1 hour = 1 - 1 = 1 9 10 90 Leak will empty the full cistern in 90 hours. Clearly, both I and II are necessary to answer the question. Correct answer is (E).
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