Question

Alone LiZ can complete a project in 12 hours and Julia could do it alone in 24 hours. Liz worked on the project alone 2 hours before Julia joined her. How many hours did they work together to finish ?

Answer 1

Julia and Liz worked 10 hours to finish the project.

Explanation:

I don't know if I am 100% right, but I believe this is the answer.

If you take the 24 hours it will take Julia to finish the project on her own and subtract the time it would take Liz you would have 12 hours left then take the 2 hours Liz has already been working on the project you would have 10 hours for both of them to finish the project together.

24 -12 = 12

12 - 2 = 10