2016 · Q49
What is the number of rounds that a wheel of diameter 5/11 m will make in traversing 7 km ?
Elementary MathematicsMensuration
- A3300
- B3500
- C4400
- D4900
Explanation
Circumference = π×5/11 = (22/7)(5/11) = 10/7 m. The number of rounds for 7 km is 7000/(10/7) = 4900 (option D).