Mathematics · Time and Work
A cistern is initially 14th full. Two inlet pipes, P and Q, can fill the empty cistern in 15 minutes and 20 minutes respectively, while an outlet pipe, R, can empty the full cistern in 30 minutes. Pipes P and Q are opened simultaneously. After 'x' minutes, the outlet pipe R is also opened. If the cistern is completely filled in a total of 8 minutes from the start, find the value of 'x'.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 24 minutes
- 35 minutes
- 43.5 minutes
Correct answer
2.5 minutes
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