A cistern can be filled by a tap in 7hours and emptied by outlet pipe in 9hours. How long will it take to fill the cistern if both the tap and pipe are opened?
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3
Answer:
A cistern can be filled by a tap in 12 hours and by the other tap in 9 hours. If both taps are opened together how long will it take to fill the cistern? Time taken by the 2nd tap to fill the cistern = 9 hours. Therefore, both taps will fill the cistern in = 36/7 hours.
Step-by-step explanation:
Answered by
8
Step-by-step explanation:
work done by tap - 1/7
work done by outlet pipe -- -1/9
total work done = 1/7 -1/9 = 2/63
Time taken = 63 /2 hours
= 31 hours 30 min
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