Question

A, B, C can do a work in 6,8,12 days respectively. B and C work together for 2 days, Then A takes C's place. How long will it take to finish the work​

Answer 1

2(B+C)= 2(1/8+1/12)

2×5/24=5/12

last work = 1-5/12

7/12

A+C= 1/6+1/12

=3/12=4

7/12×4

=7/3

finish work is 2+7/3=13/3 days