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