Question 854653
let helper take x hours to do the job alone
the carpenter will take x/(1.5 ) hours to do the job alone

x/(1.5) = 2x/3

In one day they both do
3/2x + 1/x of the job

3/2x + 1/x = 1/24

(3+2)/2x = 1/24

5*24= 2x
120=2x
x=60

helper does alone in 60 days

Carpenter does in 60/1.5 = 40 days