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Karan Martin

· started a discussion

· 1 Months ago

sol (Question:113285.0)

Let pipe C alone can empty the cistern in x min.
A fills cistern in 1 min = 1/10;
B fills cistern in 1 min = 1/15;
A and B together fill in 1 min = (10*15)/(10+15) = 6 min
Since, waste pipe was left open for 6 min then,
6 min, 6/x part of cistern will be emptied by C.
Now,
6/x part of the cistern would be filled by A and B in 2 min.
Hence,
cistern will be filled in 3/x min. And
x/3 = 6
x = 18 min.

Baradi Manikanta

· started a discussion

· 1 Months ago

Sol (Question:113285.0)

(a+b)*2=c*6;
,(A+b)/c=3/1;
30/(5/3)=18

Question:

Three pipes A, B and C are attached to a cistern. A can fills it in 10 minutes and B in 15 minutes. C is a waste pipe for emptying it. After opening both the pipes A and B, a man leaves the cistern and returns when the cistern should have been just full. Finding how ever that the waste pipe had been left open, he closes it and the cistern now gets filled in 2 minutes. In how much time the pipe C, if opened alone, empty the full cistern:

Options:
A) 18 minutes
B) 20 minutes
C) 16 minutes
D) 22 minutes
Solution:
Ans: (a)

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