Aptitude - Pipes and Cistern - Discussion
Discussion Forum : Pipes and Cistern - General Questions (Q.No. 11)
11.
One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in:
Answer: Option
Explanation:
Let the slower pipe alone fill the tank in x minutes.
| Then, faster pipe will fill it in | x | minutes. |
| 3 |
 |
1 | + | 3 | = | 1 |
| x | x | 36 |
 |
4 | = | 1 |
| x | 36 |
x = 144 min.
Discussion:
67 comments Page 6 of 7.
Hafee said:
1 decade ago
Let it be 3x, 1x.
So, 4x = 1/36.
Then x = 144.
So, 4x = 1/36.
Then x = 144.
Miss Mathphobia said:
1 decade ago
Why not x+x/3=36?
It gives me answer as 27...
It gives me answer as 27...
Mostafizur Rahman said:
5 years ago
1/x + 1/3x = 1/36,
3 + 1/3x = 1/36,
3x = 144.
3 + 1/3x = 1/36,
3x = 144.
Karthiga said:
1 decade ago
Why we take 1/x+3/x instead of x + x/3 =36 ?
Ali said:
1 decade ago
@Karthik how it is x square=12 and x =144???
Pri said:
1 decade ago
Please expain this solution more clearly.
Khagendra said:
8 years ago
Most effective solution, Thanks @Laxman.
Rishab said:
1 decade ago
How do we know that 1/a + 1/b = 1/36 ?
Poornima said:
1 decade ago
Why do we need to take time as 1/time?
Santosh said:
7 years ago
Thanks for explaining @Mahima.
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