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A tap can fill a cistern in 8 hours and another tap can empty it in 16 hours. If both the taps are open, the time (in hours) taken to fill the tank will be :
  • a)
    24
  • b)
    8
  • c)
    10
  • d)
    16
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A tap can fill a cistern in 8 hours and another tap can empty it in 16...
Part of the cistern filled in 1 hour = 1/8
Part of the cistern emptied in 1 hour = 1/16
When both the taps are opened simultaneously, part of cistern filled in 1 hour

Hence, the cistern will be filled in 16 hours.
Using Rule 7,
Here, x = 8, y = 16
Required time 
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