Answer:
21h miles
Step-by-step explanation:
biking time = h
walking time = 2h
running time = (1/4)(2h) = h/2
total distance = biking distance + walking distance + running distance
= (10)(h) +(3)(2h) +(10)(h/2)
= 10h + 6h + 5h
Total distance equal 21h miles
