Pipes and Cistern - Quantitative Aptitude (MCQ) questions for Q. 29730

Q.  A cistern has two taps attached to it. Tap B can empty the cistern in 45 minutes. But Tap A can fill the cistern in just 30 minutes. Rohit started both taps unknowingly but realized his mistake after 30 minutes. He immediately closed Tap B. Now after this, in how much time will the cistern be filled?
- Published on 03 May 17

a. 30 minutes
b. 45 minutes
c. 15 minutes
d. 20 minutes

ANSWER: 20 minutes
pipes and cisterns

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