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A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:

(a) 20 days
(b) 22.5 days
(c) 25 days
(d) 30 days


(b) 22.5 days is the answer.
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Work ratio ->A:B=3:1
hence time ratio,reverse of work ratio ->A:B=1:3
let x be day taken by B to complete work
hence x-60 days taken by A according to question
after solving this equation
answer will be x=90
and b=x-60=30
together they finishe work in  1/30+1/90

=2/45 = 22.5 days
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