A can complete a piece of work alone in 120 days, while A and B, working…
2023
A can complete a piece of work alone in 120 days, while A and B, working together ,can complete this piece of work in 72 days. In how many days can B, working alone, complete this piece of work?
Answer: A. 180 — A's rate is 1/120 and A+B's rate is 1/72. B's rate is 1/72 - 1/120 = 1/180, so B alone takes 180 days.
- A.
180
- B.
200
- C.
160
- D.
216
Attempted by 143 students.
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Correct answer: A
A's rate is 1/120 and A+B's rate is 1/72. B's rate is 1/72 - 1/120 = 1/180, so B alone takes 180 days.
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