Question

this one is difficult please solve this problem.

Answer 1

A's one day work=1/10
B's one day work =3/20

(A+B)'s one day work=1/10+3/20
                                 =5/20
                                 =1/4

A and B finish the work in 4 day..
Answer is B(4 day)..

I hope its help you...

Answer 2

 A's one day work = 1/10 
B's one day work = 20/3 


Therefore, A+B = 1/10+20/3
                         = 1/4

Hence, it takes four days to complete the job if A and B work together.