Question

1. A and B can complete a job in 20 days. B and C can
complete it in 30 days A and C can complete it in 40
days. In how many days can A, B and C complete it by
working together
f(1) 180/13
(2) 240/13
--73) 280/13
(4) 300/13​

Answer 1

Step-by-step explanation:

A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days.

and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days.2*(A+B+C)'s one day work = 1/20 + 1/30 +1/40 = 13/120 work

and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days.2*(A+B+C)'s one day work = 1/20 + 1/30 +1/40 = 13/120 work(A+B+C)'s one day work = 13/240 work

so,A,B and C will take a total of 240/13 days to finish the work together.(take reciprocal of 13/240)