It takes 30.07 minutes for Charmaine to run 4 miles
Step-by-step explanation:
Given:
Distance covered by Charmaine = 6 miles
Time taken by Charmaine to run 6 miles = 45 minutes
To find:
Time taken by Charmaine to run 4 miles=?
Solution:
We know that ,
...................(1)
Substituting the values given in the question,

speed=0.133 miles/minute
Re writing the equation (1), we have,

Now substituting the spees and distance values, we get
Time taken by Charmaine to run 4 miles= 
Time taken by Charmaine to run 4 miles= 30.07 minutes.