Set Up and Solve a Proportion for Each Application Problem $\frac{90}{40}=\frac{60}{x}$

Set up and solve a proportion for each application problem.
-Which proportion is correct for this application problem?
Lilly can address 40 cards in 90 minutes. How long will it take her to address 60 cards?

A) $\frac{90}{40}=\frac{60}{x}$
B) $\frac{90}{60}=\frac{40}{x}$
C) $\frac{40}{60}=\frac{x}{60}$
D) $\frac{40}{90}=\frac{60}{x}$