Final answer:
Josie's speed is 3.75 miles per hour.
Step-by-step explanation:
To find Josie's speed in miles per hour, we need to calculate the distance she walks in miles and the time it takes her in hours.
First, let's convert 3 4 mile to a decimal. 3 4 can be written as 3/4, which is equal to 0.75 miles.
Next, let's convert 1 5 hour to a decimal. 1 5 can be written as 1/5, which is equal to 0.2 hours.
Now, we can calculate Josie's speed by dividing the distance (0.75 miles) by the time (0.2 hours). 0.75 / 0.2 = 3.75 miles per hour.