If Jack walked 6 miles in 1 hour and 15 minutes, what was his rate of walking in miles per hour?	Choose one.
A) 4	B) 4.8	C) 6	D) 6.25	E) 15

Rationale: "distance walked in 1 hour and 15 mins = 6 miles speed per hour = distance / time = 6 / ( 5 / 4 ) = 4.8 miles per hour answer b"
Answer: B