Lessons

General Aptitude
31.3 Pipes and Cistern - Data Sufficiency 2

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Q.

 

If both the pipes are opened, how many hours will be taken to fill the tank?

I. 

The capacity of the tank is 400 litres.

II. 

The pipe A fills the tank in 4 hours.

 III. 

The pipe B fills the tank in 6 hours.

View Answer

Correct choice: B

Explanation:

II. Part of the tank filled by A in 1 hour = 1
4
III. Part of the tank filled by B in 1 hour = 1
6
(A + B)'s 1 hour's work = 1 + 1 = 5
4 6 12
∴ A and B will fill the tank in 12 hrs = 2 hrs 24 min.
5

So, II and III are needed.

∴ Correct answer is (B).

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