Aptitude - Pipes and Cistern - Discussion
Discussion Forum : Pipes and Cistern - General Questions (Q.No. 7)
7.
A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?
Answer: Option
Explanation:
Suppose pipe A alone takes x hours to fill the tank.
| Then, pipes B and C will take | x | and | x | hours respectively to fill the tank. |
| 2 | 4 |
 |
1 | + | 2 | + | 4 | = | 1 |
| x | x | x | 5 |
 |
7 | = | 1 |
| x | 5 |
x = 35 hrs.
Discussion:
33 comments Page 3 of 4.
SABYASACHI said:
1 decade ago
@Abhishek. We are calculating per hour, that's why we are taking the reverse of (x, x/2, x/4)...
Vineeth said:
7 years ago
Considering the value of A as X, B as 2X and C as 4X. Can anybody help me in solving this ?
(2)
Nick said:
1 decade ago
Why summation is in the form of 1/x + 2/x + 4/x?
It should be x + x/2 + x/4 ?
Isn't it?
It should be x + x/2 + x/4 ?
Isn't it?
Rkay said:
2 years ago
R*T = w
(4+2+1) * 5 = w
7*5 = w
W = 35
An efficiency = 1
Time taken = 35/1 = 35.
(4+2+1) * 5 = w
7*5 = w
W = 35
An efficiency = 1
Time taken = 35/1 = 35.
(6)
Ritwik said:
6 years ago
B is twice as fast as A so if A=x, B=2x then how x/2?
(3)
Abhishek said:
1 decade ago
Why summation is not in this form?
X+x/2+x/4 = 1/5.
X+x/2+x/4 = 1/5.
Richa said:
1 decade ago
If B is half time as fast than A. Then B=2X?
Laxmi said:
1 decade ago
Hi friends please tell how 1/5 is come here.
Usha said:
1 decade ago
1/x+2/x+4/x = 7/x. How it will possible?
Naveen chowdary said:
9 years ago
Why not it is 1/x + 1/2x + 1/4x = 1/5?
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