A bicycle wheel has a diameter of 0.51m. How many complete revolutions does it make in 1km? Choose one.
A) 246
B) 448
C) 1408
D) 710
E) 624
1 revolution = 3.14 * diameter.   Number of revolutions in 1km = 1000m / ( 3.14 * 0.51m ) = 624.5. Hence 624 complete revolutions.   Answer 624
<result>E</result>
A bicycle wheel has a diameter of 0.51m. How many complete revolutions does it make in 1km?