Question

A can do a piece of work in 4 hours. a and c together can do it in just 2 hours, while b and c together need 3 hours to finish the same work. b alone can complete the work in --- hours

Answer 1

Answer:12 hours

Step-by-step explanation:

Work done by A: 1/4 per hr

Work done by A+C: 1/2 per hr

Work done by B+C: 1/3 per hr

WD by C=WD(A+C)-WD(A)=1/2- 1/4=1/4

WD by B=WD(B+C)-WD(C)=1/3- 1/4=1/12

Hence, Work done by B=12 hrs