Question 9
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A and B together finish a job in 15 days, B and C in 20 days, and all three in 12 days. How long would B alone take?
- A 30 days Correct
- B 60 days
- C 20 days
- D 24 days
Correct Answer: Option A
A = 1/12 − 1/20 = 1/30
C = 1/12 − 1/15 = 1/60
B = 1/12 − 1/30 − 1/60 = 2/60 = 1/30
B alone = 30 days
Answer: 30 days
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