Answer : 3 13 days Explanation : Answer: C) 13 days Explanation: Ratio of times taken by A and B = 100 : 130 = 10 : 13.Suppose B takes x days to do the work.Then, 10 : 13 :: 23 : x =

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A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days ?