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Two pipes can fill a cistern in 20 minutes and 30 minutes respectively. Both pipes being opened, time when the first pipe must be turned off so that the cistern may be filled in 10 minutes more will be
This question appeared in the WBPSC Prelims 2018 examination (GS). It is Question 72 out of 198 questions in this paper.
This question was part of the WBPSC Prelims 2018 (GS). The WBPSC Prelims examination tests candidates on general studies, current affairs, and aptitude through multiple-choice questions.
Practice previous year questions from all WBPSC Prelims papers and compare patterns with UPSC Prelims PYQ to identify overlapping topics.