Aptitude - Pipes and Cistern - Discussion
Discussion Forum : Pipes and Cistern - General Questions (Q.No. 2)
2.
Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:
Answer: Option
Explanation:
| Net part filled in 1 hour |  |
1 | + | 1 | - | 1 |  |
= | 17 | . |
| 5 | 6 | 12 | 60 |
 The tank will be full in |
60 | hours i.e., 3 | 9 | hours. |
| 17 | 17 |
Discussion:
57 comments Page 3 of 6.
Jerry said:
9 years ago
Thank you @Manasa.
Ramya said:
9 years ago
Thank you @Manasa.
Rohit said:
8 years ago
Thanks @Manasa.
Mahesh said:
8 years ago
How the 17 came? Please explain me.
Prabhat said:
8 years ago
Just take it by formula.
5 * 6 * 12/6 * 12+ 5 * 12-5 * 6 = 60/17.
5 * 6 * 12/6 * 12+ 5 * 12-5 * 6 = 60/17.
Rupa said:
6 years ago
@Sekhar.
17*3+9/60 = 60/17.
17*3+9/60 = 60/17.
Naushad said:
7 years ago
Dear Sir,
I think the pipes that filling the tank operates under constant pressure. So the flow rate is constant. But the pipe that is draining is operating under varying head, ie. Under varying pressure. So the draining of tank is not uniform, but proportional to the square root of the head. Hence the problem can't be solved using simple mathematics. For centuries we put it in wrong way.
I think the pipes that filling the tank operates under constant pressure. So the flow rate is constant. But the pipe that is draining is operating under varying head, ie. Under varying pressure. So the draining of tank is not uniform, but proportional to the square root of the head. Hence the problem can't be solved using simple mathematics. For centuries we put it in wrong way.
Amudha said:
7 years ago
How it will come 17/60 to 60/17?
Kavi said:
7 years ago
@Neha how?
(51/180)dividing numerator &denominator by 2.
= (17/60).
(51/180)dividing numerator &denominator by 2.
= (17/60).
Sandeep said:
10 years ago
Can you please explain it clearly that how we get 3*9/17?
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