Extra credit word problem

I need some help with this bonus problem. Any help would be appreciated.

A train rolls down a track at 60mph. It has wheels with radius = 15 in. The wheels contain a flange designed to hold the train on the track that extends 1 in from the radius of the riding surface

Since Point A (on the flange) is farther from the center of the wheel than Point B (the wheel), it is moving faster than B.

Due to this phenomenon, there is portion of the rotation that Point A is moving backward with respect to the ground.

Find the duration of this time period in seconds (Accurate to 10 decimals).

Hint: The answer is very near one hundredth of a second.