Marta walked at 4.1 miles per hour for 0.85 hours. How far did she walk?

Since her velocity or speed is 4.1 mile per hour

the distance traveled can be found using

d=vt

d = (4.1) (0.85) = 3.485 miles

is our answer logical if she travels 4.1 miles in a single hour that means in less than an hour she will travel less than 4.1 which is true for our answer.