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Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
  • a)
    12 minutes
  • b)
    15 minutes
  • c)
    25 minutes
  • d)
    50 minutes
  • e)
    None of the above
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. I...
Part filled by A in 1 minute = 1/20
Part filled by B in 1 minute = 1/30
Part filled by (A + B) in 1 minute 

∴ Both pipes can fill the tank in 12 minutes
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Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?a)12 minutesb)15 minutesc)25 minutesd)50 minutese)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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