Question

A B can do a work in 8 days B C can do it in 12 days A B C can do it in 6 days find the time for A C to do the work

Answer 1

A=8 days
B & C = 12 days
ABC =6 days
=1/8+1/12+1/6
=3/24+2/24+4/24
=9
9 hours AC do the work