Engineering Board Exam Reviewer · Work Problems · medium
A and B together can finish a job in 12 days. A alone can finish it in 20 days. How many days would B need to do the job alone?
- 8 days
- 32 days
- 30 days
- 15 days
Answer
C. 30 days
Solution
B's rate is 112- 120=5-3/60= 130 per day, so B needs 30 days.
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