A bicycle wheel has a diameter of 0.51m. How many complete revolutions does it make in 1km?  Choose the correct choice.
A) 246  B) 448  C) 1408  D) 710  E) 624

Rationale: 1 revolution = 3.14 * diameter . number of revolutions in 1 km = 1000 m / ( 3.14 * 0.51 m ) = 624.5 . hence 624 complete revolutions . answer e
Answer: E