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A is thrice as good a workman as B and therefore is able to finish a job in 40 days less than B.

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A is thrice as good a workman as B and therefore is able to finish a job in 40 days less than B. Working together, they can do it in: 

(a) 14 days 

(b) 13 days 

(c) 20 days 

(d) 15 days

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Correct option (d) 15 days

Explanation: 

According to question,

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