Question

Ron runs at a speed of 3 1/2 miles in 1/2 of an hour.How fast is his average speed per hour?

Answer 1

i could be oh so wrong but i think it is 62/4

Answer 2

distance = rate times time.  If you want the rate,   solve this equation for it.
                                                     3.5 mi
Correct result:  rate (speed) = ---------------- = 7 mph (average speed)
                                                      0.5 hr