Ruth walks at a constant speed of 5\:km/h. How many minutes will it take her to walk 1.5\:km?

**Answer Choices**

A. 20

B. 24

C. 18

D. 15

E. 7.5

Ruth walks at a constant speed of 5\:km/h. How many minutes will it take her to walk 1.5\:km?

**Answer Choices**

A. 20

B. 24

C. 18

D. 15

E. 7.5