Answer:
3 mph
Explanation:
So if you would multiply 6 by two, since 6 is only a distance Igor would run per an hour, you would get 12 which is the planned distance both Sally and Igor are running. Then divide 12 by four since we know that Sally runs 12 miles but does it in four hours.
12 / 4 = 3.
So the answer is gonna be 3 mph.
Hope this helps :)