Answer:
12 miles
Explanation:
Since, Sumalee ran 34 miles more than Heather.
therefore
Distance run by Sumalee = Distance run by Heather + 34 miles
S = H + 34
But, S = 46 miles (given)
So, 46 = H + 34
H = 46 - 34
H = 12 miles
Distance run by Heather = 12 miles