Question

solve it this question

Answer 1

According to the question (A+B)'s one day work= 1/72 (B+C)'s one day work=1/120 (C+A)'s one day work=1/90 On Adding all the 3  2(A+B+C)'s one day work=1/72+1/120+1/90 =5+3+4/360= 1/30 Therefore (A+B+C)'s one day work= 1/60 Therefore A,B,C can together finish the whole work in 60 days Hence the option is B

Answer 2

(A+B)'s one day work= 1/72

(B+C)'s one day work=1/120

(C+A)'s one day work=1/90