Two pipes A and B can fill a cistern in 37 [https://www.indiabix.com/_files/images/aptitude/1-div-1by2.gif] minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:
- A. 5 min.
- B. 9 min.
- C. 10 min.
- D. 15 min.
✅ Correct Answer: 9 min.
Explanation
Let B be turned off after x minutes. Then, Part filled by(A+B)in x min.+Part filled by A in(30-x)min.=1. 2/(75)+[https://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif] 11x/(225)+[https://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif] 11x+180-6x=225. [https://www.indiabix.com/_files/images/aptitude/1-sym-imp.gif] x=9.
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