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Two pipes A and B fill a tank. Pipe A fills the tank thrice as fast as Pipe B. lf both pipes are kept open together when the tank is empty, the tank will be full in 18 minutes. How long will pipe B alone take to fill the tank?

A) 72 minutes
B) 64 minutes
C) 58 minutes
D) 50 minutes

Correct Answer:

A) 72 minutes

Description for Correct answer:
\( \Large \frac{1}{\frac{B}{3}}+\frac{1}{B}=\frac{1}{18}\ or\ \frac{3}{B}+\frac{1}{B}=\frac{1}{18} \)

or \( \Large B = 18 \times 4 \) = 72 min.

Part of solved Pipes and Cisterns questions and answers : >> Aptitude >> Pipes and Cisterns

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Similar Questions

1). A pump can be used either to fill or to empty a tank. The capacity of the tank is 3600 \( \Large m^{2} \). The emptying capacity of the pump is 10 \( \Large \frac{m^{2}}{min} \) higher than its filling capacity. What is the emptying capacity of the pump if the pump needs 12 more minutes to fill the tank than it takes to empty the tank?

A). \( \Large 40 m^{3}/min \)

B). \( \Large 60 m^{3}/min \)

C). \( \Large 80 m^{3}/min \)

D). \( \Large 100 m^{3}/min \)

2). Pipe A can fill the tank in 30 minutes and pipe B can fill the same tank in 20 minutes. Both the pipes are kept open simultaneously. When should pipe B be switched off, so that the tank may fill in exactly 24 minutes?

A). 5 minutes

B). 7 minutes

C). 4 minutes

D). 3 minutes

3). Two pipes A and B can fill a tank in 45 minutes and 40 minutes respectively. They are kept open simultaneously and after some time pipe A was switched off. Pipe B fills the rest of the tank in 23 minutes after pipe A was switched off. How long was pipe A kept open?

A). 5 minutes

B). 8 minutes

C). 6 minutes

D). 9 minutes

4). In a kilometer race between A and B, A wins by 60 m or 12 seconds. How long does A take to finish the race?

A). 188 seconds

B). 150 seconds

C). 120 seconds

D). 130 seconds

5). A takes 3 min 45 seconds to run a kilometer, while B takes 4 minutes to run a kilometer. If A and B were to participate in a race of 2 kms, by how many meters will A win the race?

A). 135 meter

B). 125 meter

C). 110 meter

D). 140 meter

6). A runs \( \Large 1\frac{1}{4} \)th as fast as B and wins the race by 25 meters. What is the length of the race?

A). 110 meters

B). 140 meters

C). 125 meters

D). 150 meters

7). In a 100 m race between A and B, A wins by 10 m. In a 100 m race between B and C, B wins by 10 m. In a 100 m race between A and C, who will win and by how much?

A). A, by 4 meters

B). A, by 12 meters

C). A, by 10 meters

D). A, by 19 meters

8). In a 500 m race between A and B. A wins by 20m. In the same race between A and C, A wins by 30 m, If B and C were to run a 500 m race, who will win the race and by how much?

A). B, 10.5 meters

B). B, 12.5 meters

C). B, 14.5 meters

D). B, 15.5 meters

9). In a 100m race, A runs at 5 m/sec. Even if B starts 8 m ahead of A. A wins by 3 sec., What is the speed of B?

A). 6 m/sec

B). 4 m/sec

C). 2 m/sec

D). 1 m/sec

10). In a km race, even if B starts 20 seconds ahead, A wins by 40 m. However, if B starts 25 seconds ahead they finish together. What are their respective speeds in m/sec?

A). A-12 m/sec, B-10 m/sec

B). A-15 m/sec, B-13 m/sec

C). A-10 m/sec, B- 8 m/sec

D). A-16 m/sec, B-14 m/sec