Copiers A and B working together can print in 70 minutes. Copier A alone takes 150 minutes to print. Determine how long it would take copier B alone to print

Question

Please help me with this rate problem

Answer 1

We set up the equation by asking how much of the job can each copier do in one minute?

 

Together, they can do 1/70 of the job in a minute

 

Alone, A does 1/150 of the job

 

We need to find out how much of the job B can do alone in one minute. We can call that 1/x

 

1/x + 1/150 = 1/70

 

1/x = 1/70 - 1/150

 

1/x = 15/1050 - 7/1050

 

1/x = 8/1050

 

x = 1050/8 = 131.25 minutes