Answer:
B.64 miles
Step-by-step explanation:
Let Oliver's be x
Let Stephanie's be y
[tex]x = 2y - - - (a) \\ x + y = 96 - - - (b)[/tex]
substitute for x in (b):
[tex]2y + y = 96 \\ 3y = 96 \\ y = 32[/tex]
find x in (a):
[tex]x = (2 \times 32) \\ x = 64[/tex]