If a man travels f miles an hour for m hours and r miles an hour for s hours, what is his average rate in miles per hour for the entire distance traveled?
Pick one
A) fm + rs
B) (fm + rs)/2
C) m/f + s/r
D) (fm + rs)/(m + s)
E) (fm + rs)/(t - s)
Average Speed = Total (fm + rs)/(m + s)istance /Total Time Taken   Total (fm + rs)/(m + s)istance travelled in m hours = fm   Total (fm + rs)/(m + s)istance travelled in s hours = rs   Total Time taken = m+s   Therefore , Average Speed = (fm+ms)/(m+s)   Answer (fm + rs)/(m + s)
<result>D</result>
If a man travels f miles an hour for m hours and r miles an hour for s hours, what is his average rate in miles per hour for the entire distance traveled?