Question

please give me answer to this question​

Answer 1

Answer:

I think option B is right

Answer 2

A’s one hour’s work = 1/4

(B + C)’s one hour’s work = 1/3

(A + C)’s one hour’s work = 1/2

∴ C’s one hour’s work = 1/2- 1/4

=1/4

B’s one hour’s work = 1/3- 1/4

=1/12

Hence B alone can do the work in 12 hours, so option [D] is correct answer.