Question

48. A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together
can do it in 2 hours. How long will B alone take to do it?
(1 Point)​

Answer 1

Answer:

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 = 2-1/4 = 1/4

B’s one hour’s work = 1/3 - 1/4 = 4-3/12 = 1/12

Hence B alone can do the work in 12 hours.