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