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A tank has two pipes – A and B, attached to it. A can fill the tank in 20 minutes, whereas pipe B can empty the tank in 30 minutes. If both A and B are opened alternately for one minute each, how long will it take to fill the tank?
  • a)
    121 minutes
  • b)
    110 minutes
  • c)
    115 minutes
  • d)
    119 minutes
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A tank has two pipes – A and B, attached to it. A can fill the t...
Pipe A can fill the tank in 20 minutes.
So, part of the tank filled in 1 minute = 1/20
Pipe B can empty the tank in 30 minutes.
So, part of tank emptied in 1 minute = 1/30
Part of tank filled in 2 minutes (Pipe A is opened for 1 minute and Pipe B is opened for the next 1 minute)= 1/20 – 1/30 = 1/60
Part of the tank filled in 59 × 2 = 118 minutes = 59/60.
The last 1/60th part is filled in 119th minute.
Hence, the tank is filled in around 119 minutes.
Option (d) is the correct answer.
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A tank has two pipes – A and B, attached to it. A can fill the tank in 20 minutes, whereas pipe B can empty the tank in 30 minutes. If both A and B are opened alternately for one minute each, how long will it take to fill the tank?a)121 minutesb)110 minutesc)115 minutesd)119 minutesCorrect answer is option 'D'. Can you explain this answer?
Question Description
A tank has two pipes – A and B, attached to it. A can fill the tank in 20 minutes, whereas pipe B can empty the tank in 30 minutes. If both A and B are opened alternately for one minute each, how long will it take to fill the tank?a)121 minutesb)110 minutesc)115 minutesd)119 minutesCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about A tank has two pipes – A and B, attached to it. A can fill the tank in 20 minutes, whereas pipe B can empty the tank in 30 minutes. If both A and B are opened alternately for one minute each, how long will it take to fill the tank?a)121 minutesb)110 minutesc)115 minutesd)119 minutesCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A tank has two pipes – A and B, attached to it. A can fill the tank in 20 minutes, whereas pipe B can empty the tank in 30 minutes. If both A and B are opened alternately for one minute each, how long will it take to fill the tank?a)121 minutesb)110 minutesc)115 minutesd)119 minutesCorrect answer is option 'D'. Can you explain this answer?.
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