Question: Tobias rode his *** on a *** for a *** *** ***. On average, he passed a 1 *** marker every 3 *** during this ***. Which of the following was his *** *** for this *** *** ***?  (A) 10 km/hr (B) 15 km/hr (C) 20 km/hr (D) 25 km/h.
E.