 
                 
                InterviewSolution
 Saved Bookmarks
    				| 1. | A cistern can be filled by one tap in 8 hours, and by another in 4 hours. How long will it take to fill the cistern if both taps are opened together? | 
| Answer» The given details are, A cistern can be filled by one tap in = 8 hours A cistern filled by one tap in 1 hour = 1/8 Another cistern can be filled in = 4 hours Cistern filled by another tap in 1 hour = 1/4 Total cistern filled in 1 hour = 1/4 + 1/8 = (2+1)/8 = 3/8 ∴ Cistern can be filled when both the taps are opened together in = 8/3 = 2 2/3 hours | |