Two Hikers Begin on Opposite Sides of a Circular Lake

Multiple Choice

Two hikers begin on opposite sides of a circular lake and walk around the lake in the same direction.One walks three times as fast as the other.The circumference of the lake is L.How far does the faster hiker walk before catching up to the slower one?

A) L/3
B) L/2
C) 3L/4
D) L