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Two pipes can fill a tank in 10 hours and 12 hours respectively while a third pipe empties the full tank in 20 hours.If all the three pipes operate simultaneously, in how much time will the tank be filled?
  • a)
    7hrs
  • b)
    8hrs
  • c)
    7hrs 30 min
  • d)
    9hrs 30min
  • e)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Two pipes can fill a tank in 10 hours and 12 hours respectively while ...
Net apart filled in 1 hour = (1/10+1/12-1/20)
= 8/60 = 2/15.
Tank will be full in = 15/2 hours ⇒ 7 hrs 30 min.
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Community Answer
Two pipes can fill a tank in 10 hours and 12 hours respectively while ...
C. 7hrs 30 mins
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