Question

A and b can do a work in 60 days b and c can do a work in 120 days a and c can do a work in 80 days. a alone can do the work in how many days

Answer 1

A and B work in a day=1/60
Let a be the days required by A
1/a+1/b=1/60
1/b+1/c=1/120
1/c+1/a=1/80solving a=96 days