B) 60 days

C) 28 days

D) 45 days

Let Baber take X-days to complete the work alone.

Therefore 1/60 + 1/X= 1/20

So, 1/X = 1/20 – 1/60

X = (3–1)/60= 2/60

= 1/30

So Baber can complete the work alone in= 30 days.

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