Subject: General Aptitude · Chapter: Pipes and Cisterns · Exam: · Marks: · Difficulty:
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.
(a)Only I and II
(b)Only II and III
(c)All I, II and III
(d)Any two of the three
(e)Even with all the three statements, answer cannot be given. statements. You have to decide whether any information given in the statement(s) is not required.
Answer
Answer (as printed): 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 work $= \left(\frac{1}{4}+\frac{1}{6}\right) = \frac{5}{12}$.
Explanation as extracted from the printed page; notation may be imperfect.