Solving Rational Equations

Question

Katie can do a job in 6 hours. If she works with Blake, together they can get the job done in 4 hours. How long would it take Blake to do the job alone?

Answer 1

1/b + 1/6 = 1/4

1/b = 1/4 -1/6 = 1/12

b = 12 hours working alone

Blake is twice as slow as Katie