Discuss Forum
1.
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 :
- A. 20 days
- B. 20 days
- C. 20 days
- D. 20 days
Answer: Option B
Explanation:
Let, A can finish the job in x days
B can finish the job in 3x days.
According to the question
3x - x = 60
2x = 60
x = 30 days
B can finish the job in 3 × 30 or, 90 days
In 1 day A can finish 1/30 th job
In 1 day B can finish 1/90 th job
In 1 day both A and B can finish 1/30 + 1/90 th job
= 3 + 1 /90 = 2/45 th
both A and B can finish the job in 1/2/45 = 22.5 days.
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