A wheel makes 2000 rounds when it covers a distance of 88 km. Find the radius of the wheel?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 7 m
Total distance covered = 88 km = 88,000 m
Number of rounds = 2000
So, circumference of the wheel:
$\text{Circumference} = \frac{88{,}000}{2000} = 44 \text{ m}$
Now,
$2\pi r = 44 \Rightarrow r = \frac{44}{2\pi} = \frac{22}{\pi}$
Using $\pi = \frac{22}{7}$:
$r = \frac{22}{22/7} = 7 \text{ m}$