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For the following questions answer them individually

If A alone can complete a work in 20 days and B alone can complete the same work in 30 days, then which of the following statement(s) is/are correct?
I. Ratio of efficiency of A and B is 3 : 2.
II. Working together A and B can complete the same work in 12 days.

 

[SSC CHSL 10th March 2023 Shift-2 With Answers]
A
B
C
D

EXPLANATION

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