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A and B together can dig a big trench in 12 days. A alone can dig in 30 days . In how many day B can dig

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A and B together can dig a big trench in 12 days. A alone can dig in 30 days . In how many day B can...

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A and B together can dig a big trench in 12 days. A alone can dig in 30 days . In how many day B can dig​

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A and B together can dig a big trench in 12 days. A alone can dig in 30 days . In how many day B can dig