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Pipes M and N can fill a cistern in 15 hours together. But if these pipes operate separately M takes 40 hours less than N to fill the tank. In how many hours the pipe M will fill the cistern working alone?
  • a)
    15 hours
  • b)
    20 hours
  • c)
    40 hours
  • d)
    60 hours
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Pipes M and N can fill a cistern in 15 hours together. But if these pi...
Let M takes x hours
Then, N = (x+40) hours
1/x + 1/(x+40) = 1/15
Therefore, x = 20
Hence the pipe M will fill the cistern in 20 hours
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Pipes M and N can fill a cistern in 15 hours together. But if these pipes operate separately M takes 40 hours less than N to fill the tank. In how many hours the pipe M will fill the cistern working alone?a)15 hoursb)20 hoursc)40 hoursd)60 hoursCorrect answer is option 'B'. Can you explain this answer?
Question Description
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