Frank Rides His Bike 10 Mph Faster Than He Walks

Multiple Choice

Frank rides his bike 10 mph faster than he walks. He can bike from home to work in the same amount of time that it takes him to walk from home to the park. If the distance from Frank's home to work is 6 miles and the distance from his home to the park is 2 miles, what is Frank's walking speed?

A) 7 mph
B) 6 mph
C) 6.5 mph
D) 5 mph