Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 4)
4.
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
Answer: Option
Explanation:
Ratio of times taken by A and B = 1 : 3.
The time difference is (3 - 1) 2 days while B take 3 days and A takes 1 day.
If difference of time is 2 days, B takes 3 days.
| If difference of time is 60 days, B takes |  |
3 | x 60 |  |
= 90 days. |
| 2 |
So, A takes 30 days to do the work.
| A's 1 day's work = | 1 |
| 30 |
| B's 1 day's work = | 1 |
| 90 |
| (A + B)'s 1 day's work = | |
1 | + | 1 | |
= | 4 | = | 2 |
| 30 | 90 | 90 | 45 |
 A and B together can do the work in |
45 | = 22 | 1 | days. |
| 2 | 2 |
Discussion:
292 comments Page 20 of 30.
Nikita raisadhar said:
1 year ago
3x - x=60
2x = 60
x = 30
B = 3x = 3 x 30 = 90.
A+B = 1/30 + 1/90,
= 3 + 1/90,
= 4/90,
= 2/42,
= 45/2,
= 22 1/2.
2x = 60
x = 30
B = 3x = 3 x 30 = 90.
A+B = 1/30 + 1/90,
= 3 + 1/90,
= 4/90,
= 2/42,
= 45/2,
= 22 1/2.
(74)
Nallapu Rishith Reddy said:
1 year ago
3/1 = (B)/(B-60).
As work done and time are inversely related,
so, B=90, A=30.
(1/90+1/30)=(2/45),
So, 22 1/5.
As work done and time are inversely related,
so, B=90, A=30.
(1/90+1/30)=(2/45),
So, 22 1/5.
(5)
Jiban said:
9 years ago
Can it be in this way?
B will take 180 days more than A. Then calculate for 1 day.
Can anyone solve this?
B will take 180 days more than A. Then calculate for 1 day.
Can anyone solve this?
Raseswari said:
1 year ago
I am not understanding this question.
Anyone help me to get it be explaining it along with the formulas?
Anyone help me to get it be explaining it along with the formulas?
(23)
Atul1487 said:
1 decade ago
What is need to take time difference?
How will I come to know that I need to calculate time difference?
How will I come to know that I need to calculate time difference?
Sanchi said:
1 decade ago
Very simple way.
3A=1B
B takes x days.
3 (x-60) =x
3x-x=180
X dats is B=90, A=30.
Now,
1/90+1/30=22. 5.
3A=1B
B takes x days.
3 (x-60) =x
3x-x=180
X dats is B=90, A=30.
Now,
1/90+1/30=22. 5.
Naresh said:
1 decade ago
1:3.
Total 4 parts.
90/4=22.5 (one part).
Here one part means A's work. Remaining 77.5 belongs to B.
Total 4 parts.
90/4=22.5 (one part).
Here one part means A's work. Remaining 77.5 belongs to B.
Jack said:
9 years ago
Can anyone explain me why the step 3/2*60 used. I couldn't get the logic of finding difference as 2.
TABISH said:
1 decade ago
@sheetal
do not able to understand how you get that formula to calculate the time i.e.
K*X/K^2-1
do not able to understand how you get that formula to calculate the time i.e.
K*X/K^2-1
Priya said:
7 years ago
The solution is;
A = x ,
B = 3x
x = 3x-60
x = 30
A = 30; B = 90;
1/30 + 1/90 = 2/45 = 22.5 days.
A = x ,
B = 3x
x = 3x-60
x = 30
A = 30; B = 90;
1/30 + 1/90 = 2/45 = 22.5 days.
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