Aptitude - Pipes and Cistern - Discussion
Discussion Forum : Pipes and Cistern - General Questions (Q.No. 10)
10.
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
Answer: Option
Explanation:
| Part filled in 4 minutes = 4 |  |
1 | + | 1 |  |
= | 7 | . |
| 15 | 20 | 15 |
| Remaining part = | |
1 - | 7 | |
= | 8 | . |
| 15 | 15 |
| Part filled by B in 1 minute = | 1 |
| 20 |
 |
1 | : | 8 | :: 1 : x |
| 20 | 15 |
| x = | |
8 | x 1 x 20 | |
= 10 | 2 | min = 10 min. 40 sec. |
| 15 | 3 |
The tank will be full in (4 min. + 10 min. + 40 sec.) = 14 min. 40 sec.
Discussion:
37 comments Page 4 of 4.
Vikash patel said:
1 decade ago
Why x-4?
Arunkumar said:
1 decade ago
@All.
Better don't confuse with the complex solutions! as, the main part of the quantitative exam is to minimize time, all should look for a shortest solution, (as given by @Kalpana) but not merely a solution (with complex steps).
For any question, a diagrammatic representation should be drawn roughly, to get a quick solutions. Also, 'learn by solving' is the key to prepare any exam.
All the best!
Better don't confuse with the complex solutions! as, the main part of the quantitative exam is to minimize time, all should look for a shortest solution, (as given by @Kalpana) but not merely a solution (with complex steps).
For any question, a diagrammatic representation should be drawn roughly, to get a quick solutions. Also, 'learn by solving' is the key to prepare any exam.
All the best!
Anuraag2201 said:
1 decade ago
For all those who do not have clue as to how to convert improper fractions to mixed fractions. :/.
Are you sure are ready for quants?
Are you sure are ready for quants?
Mahi said:
1 decade ago
Thanks kalapana your solution is time consuming.
Teju said:
1 decade ago
Can anybody explain 1/20:8/15::1:x?
Nikhil said:
1 decade ago
@Sudan.
Change fraction into mixed fraction.
Eg: 7/2 can be written in form on 3(1/2).
Divide numerator with denominator and whatever remainder you got write it in bracket.
Eg: a/b can be written as c(remainder/b).
Change fraction into mixed fraction.
Eg: 7/2 can be written in form on 3(1/2).
Divide numerator with denominator and whatever remainder you got write it in bracket.
Eg: a/b can be written as c(remainder/b).
Sudan said:
1 decade ago
I am weak in Maths. Please can anyone help me how to convert 44/3 into 14(2/3) ?
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