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Quantitative Aptitude

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Work and Time

Question
9 out of 30
 

A pipe can fill a tank in 6 minutes while another can empty it in 4 minutes. If both the pipes are opened when the tank is one-half empty, how soon would it be completely empty?



A 6 minutes
B 5 minutes
C 4 minute
D 720 seconds`
E None of These

Ans. A

Let work be 12 units

So, tank can empty one unit in an hour because (2- 3 = -1) and (-) show the tank being empty. Because tank can one half fill means

So it would completely empty in 6 min.

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