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A funnel can discharge a tank in 40 minutes. A second pipe with distance across twice as much as that of the first is likewise joined with the tank to purge it. The two together can exhaust the tank in:
  • a)
    8 min
  • b)
    40/3 min
  • c)
    30 min
  • d)
    38 min
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A funnel can discharge a tank in 40 minutes. A second pipe with distan...
A pipe with double diameter will take half time.
So, the second pipe can empty the full tank in 20 min.
Part emptied by both in 1 min. (1/40+ 1/20) = 3/40
Time taken to empty the full tank = 40/3 min.
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Community Answer
A funnel can discharge a tank in 40 minutes. A second pipe with distan...
A pipe with double diameter will take half time.
So, the second pipe can empty the full tank in 20 min.
Part emptied by both in 1 min. (1/40+ 1/20) = 3/40
Time taken to empty the full tank = 40/3 min.
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Question Description
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