Pipes and Cistern - Arithmetic Aptitude Questions and Answers

Home / Arithmetic Aptitude / Pipes and Cistern :: Discussion

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.

Only I and II

Only II and III

All I, II and III

Any two of the three

Even with all the three statements, answer cannot be given.

Answer : Option B

Explanation :

II. Part of the tank filled by A in 1 hour = $\frac { 1 } { 4}$

III. Part of the tank filled by B in 1 hour = $\frac { 1 } { 6}$

(A + B)'s 1 hour's work =[ $\frac { 1 } { 4}$ + $\frac { 1 } { 6}$ ]= $\frac { 5} { 12}$

A and B will fill the tank in $\frac { 12} { 5}$ hrs = 2 hrs 24 min

So, II and III are needed.

Correct answer is (B).

Be The First To Comment

Comments

Name