Can someone answer this?

Question

It took 8 painters 6 hours to paint a gym. How long would it take 12 painters? How many person-hours does this job require? 

Answer 1

8 painters working for 6 hours is 8*6=48 person-hours of work.

 

12 painters can do 48 person-hours of work in 48/12 = 4 hours,