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Two taps A and B can …

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Two taps A and B can fill a cistern in 20 and 30 minutes respectively. Both the pipes being opened, find when the first pipe must be turned off so that the cistern may be filled in 10 minutes more.
  • 1 answers

Miraj Toppo 5 years, 4 months ago

Ans. 8 minutes
http://mycbseguide.com/examin8/

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