(A) 20 Days
(B) 25 Days
(C) 30 Days
(D) 35 Days
Correct Option is: A
Work done by Aslam in 4 days = 1/60 *4
=1/15
Remaining work = 1-1/15
=(15 – 1)/15
=14/15
Now 14/15 work done by Ali in 28 days
Whole work will be done by Ali in(28*15 /14) = 2* 15 =30 days
Aslam 1 day’s work = 1/60
Ali 1 day’s work = 1/30
(Aslam + Ali )’s 1 day’s work = 1/60 + 1/30
= (1+2) /60 = 3/60
=1/20
Hence both will finish the work in 20 days