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