A bicycle wheel has a diameter of 0.61m. How many complete revolutions does it make in 1km? Options:
A) 246
B) 522
C) 1408
D) 710
E) 223

Rationale: "1 revolution = 3.14 * diameter . number of revolutions in 1 km = 1000 m / ( 3.14 * 0.61 m ) = 522.1 . hence 522 complete revolutions . answer b"
Answer: B