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Time and Work - General Aptitude

Q1:

A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

A 40

B 50

C 54

D 60

ANS:D - 60

(A + B)'s 20 day's work = ( 1 x 20 ) = 2 .
30 3
Remaining work = ( 1 - 2 ) = 1 .
3 3
Now, 1 work is done by A in 20 days.
3
Therefore, the whole work will be done by A in (20 x 3) = 60 days.