This can be treated as a ratio problem. From 3:15 to 3:20 is 5 minutes. Scott printed 12 pages in 5 minutes. That is 12 to 5. You want to know how long it will take Scott to print 15 pages at this rate. Equal the 12 to 5 ratio to 15 to “unknown time” or “t” .

12/5=15/t

Multiply both sides by 5 and t.

t*(12/5)=(15/t)*t

5*(12t/5)=15*5

12t=75

t=75/12

t=6.25 or 6 minutes and 25 seconds

## Comments

Can you please complete the question?