Management Aptitude Test Dec 2012 Paper

Question : 115 of 200

Marks: +1, -0

A, B and C are three pipes attached to a cistern. A and B can fill it in 20 min and 30 min respectively, while C can empty it in 15 min. If A, B and C be kept open successively for 1 min each, how soon will the cistern be filled?

180 min
60 min
157 min
155 min

Validate

Solution:

(a) Part of cistern filled in 3 min =

1/20+1/30-1/15=1/60

Thus, time taken to fill the cistern = 3 x 60 = 180 min

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