Aptitude - Pipes and Cistern - Discussion
Discussion Forum : Pipes and Cistern - General Questions (Q.No. 4)
4.
Two pipes A and B can fill a cistern in 37
minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:
minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:
Answer: Option
Explanation:
Let B be turned off after x minutes. Then,
Part filled by (A + B) in x min. + Part filled by A in (30 -x) min. = 1.
 x |
 |
2 | + | 1 |  |
+ (30 - x). | 2 | = 1 |
| 75 | 45 | 75 |
 |
11x | + | (60 -2x) | = 1 |
| 225 | 75 |
11x + 180 - 6x = 225.
x = 9.
Discussion:
90 comments Page 9 of 9.
Rohini said:
5 years ago
@Kasi.
Nice explanation.
Nice explanation.
Arjun said:
8 years ago
Nice work @Kasi Srinivas.
Unik said:
1 decade ago
@Rohit.
Is the answer 3?
Is the answer 3?
Unnimaya said:
7 years ago
Well said @Kasi Srinivas.
Amitha said:
1 decade ago
Good explanation -K @ $!
Gopal said:
1 decade ago
Please explain clearly.
Naidu said:
9 years ago
How 30 came after 2/75?
Leela said:
8 years ago
Thanks @Deepak.
Lakaka Levanduksu said:
2 years ago
Thanks @Anitha.
(4)
Ricky said:
1 decade ago
Excellent.
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