Algebra question

Question

George can split a cord of firewood in 6 fewer hr(s) than Tim can. When they work together, it takes them 4 hr(s). How long would it take each of them to do the job alone?

Answer 1

Let t be the # of hours for Tim to do this job alone; then t-6 is # hours for George to do this job, alone.

Their respective rate (fractions of job compoeted per hour) are 1/t and 1/(t-6).

You write, and then solve, this equation:  4(1/t ) + 4(1/(t-6)) = 1   [1 represents the entire job completion0