Correct Answer: Option B
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
=> x =(23 x 13)/10
=> x = 299/10.
A's 1 day's work =1/23;
B's 1 day's work =10/299.
(A + B)'s 1 day's work = (1/23 + 10/299)
=1/23.
Therefore, A and B together can complete the work in 13 days.
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