A and B together can dig a trench in 12 days, which A alone can dig in 30 days. How long B alone can complete it?
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Answer:
21 days
Step-by-step explanation:
B’s 1 day’s work = (A + B)’s 1 day’s work – A’s 1 day’s work
=> 1/12 - 1/28= (7-3)/84
=> 4/84 = 1/21
∴ Required time = 21 days.
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