Franklin can do a job in 6 h and Mike can do it in 4 h. What part of the job can they do by working together for 2 h? for y h?

Solution:

The speed of working together is V

V = 1/6 + 1/4 = 5/12

So when t = 2h, 2*5/12 = 5/6, so they can do 5/6 of the job