Stephanie swims laps every day. The number of laps she swims is directly proportional to the time in minutes. If the constant of proportionality for this relationship is 13 , then how many laps can she swim in 57 minutes?

a. 3 laps
b. 19 laps
c. 27 laps
d. 171 laps

It would help if you would proofread your work before you post it. I assume you mean 1:3

1/3 = x/57

Multiply both sides by 57, then divide by 3.