Management Aptitude Test Dec 2012 Paper

Question : 116 of 200

Marks: +1, -0

Two taps can separately full a cistern in 10 min and 15 min, respectively. If these two pipes and a waste pipe are kept open simultaneously, the cistern gets filled in 18 min. The waste pipe can empty the full cistern in

7 min
13 min
23 min
9 min

Validate

Solution:

(d) Let waste pipe can empty the full cistern in x min, Then

1/10+1/15-1/x=1/18

⇒

1/x=1/10+1/15-1/18

{9+6-5}/90=1/9

⇒ x = 9 min

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