An athlete runs M miles in 4 hours, then rides a bike N miles in the same number of hours. Which of the following represents the average speed, in miles per hour, for these two activities combined? Choose the correct choice from the following choices:
A) M + N / 8
B) 2M + N / 8
C) M + N / 4
D) M + 3N / 8
E) M + N / 5
M + N / 8   formular for avg speed is total distance / total time   Time spent running = 4 and the time spent biking = 4   total time is   4 + 4= 
<gadget id="calculator">  4 + 4</gadget>
<output>8</output>
8   Total distance is M+ N   Thus M + N / 8
<result>A</result>
An athlete runs M miles in 4 hours, then rides a bike N miles in the same number of hours. Which of the following represents the average speed, in miles per hour, for these two activities combined?