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 23 of 30.
Shweta pal said:
3 months ago
Why we have to take work of A=x it should be 3x?
Can anyone explain?
Can anyone explain?
(3)
Saikrishna said:
9 years ago
a b
x 3x
2x=60 so x=30
total work=3*30=90
Ans=90/4=22 1/2.
x 3x
2x=60 so x=30
total work=3*30=90
Ans=90/4=22 1/2.
Rajender said:
2 decades ago
Please tell me how you have calculated differece of time 2 days.
(1)
Keerthi said:
1 decade ago
So by the explanation above we have to take in the ratio 1:3.
Govardhan reddy said:
1 decade ago
Why were their difference between days? Please explain to me.
Malini said:
2 decades ago
Sheetal thanks a lot dear. This short cut is very much easy.
Sharan said:
2 decades ago
@Jaswinder singh: I understood your explanation man. Thanks.
Sam said:
1 decade ago
Did they mention that difference of working time is 60 days.
Anitha said:
7 years ago
A:B = 1:3
2p = 60
P = 30
30 : 90
1/30 + 1/90 = 2/45 = 22.5.
2p = 60
P = 30
30 : 90
1/30 + 1/90 = 2/45 = 22.5.
Priya said:
1 decade ago
Please say me any shortcut methods to solve this problem.
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