AP ICET 2016 Paper

Question : 103 of 200

Marks: +1, -0

Two water pipes A and B can fill an empty tank in 8 and 12 hrs. respectively and tap C at the bottom of the tank can empty the full tank in 9 hrs. If tap C is opened two hours after the pipes A and B are opened, then the total time (in hrs.) taken to fill the tank is

Validate

Solution:

Let t hours be the required total time.

∴{t}/{8}+{t}/{12}-{t-2}/{9}=1

⇒{9t+6t+-8t+16}/{72}=1

⇒7t=72-16

⇒t={56}/{7}=8

hours

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