A straight one-mile stretch of highway is 40 feet wide

A straight one-mile stretch of highway is 40 feet wide. You ride your bike on a path composed of semicircles as shown. If you ride at 5 miles per hour, how many hours will it take you to cover the one-mile stretch? Note: 1 mile = 5280 feet

This problem refers to a figure in its source book that isn't reproduced here.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #56065