If an object travels 80 feet in 4 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)	Choose the correct choice from the following answers:	A) 7.25	B) 9.47	C) 11.58	D) 13.64	E) 15.92

Rationale: "80 feet / 4 seconds = 20 feet / second ( 20 feet / second ) * ( 3600 seconds / hour ) * ( 1 mile / 5280 feet ) = 13.64 miles / hour ( approximately ) the answer is d ."
Answer: D