Question

цays 33. A and B working together can do a piece of work in 4 hours. B and C working together can do it in 3 hours. C and A work- ing together can do it in 2 hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work​

Answer 1

Answer:

a+b=4

b+c=3

c+a=2

a=b-4

c+b-4=2

b+c=6

b+c=3.

b=6-c

6-c+c=3

c=3