If Jack walked 4 miles in 1 hour and 15 minutes, what was his rate of walking in miles per hour?
Choose the correct choice from the following choices
A) 3.2	B) 4.5	C) 6	D) 6.25	E) 15

Rationale: distance walked in 1 hour and 15 mins = 4 miles speed per hour = distance / time = 4 / ( 5 / 4 ) = 3.2 miles per hour answer a
Answer: A