# Radius of Wheel 21cm, How many rounds to cover 792 meters?

The radius of a wheel is 21 cm. How many rounds will it take to cover the distance of 792 meters?

- 400
- 600
- 200
- 300

**Answer: (2) 600**

**Explanation: –
**The radius of a wheel = 21 cm

Then, the circumference of the wheel = 2 x 22 x 21/7

= 2 x 22 x 3

= 132 cm

The distance covered by wheel in a round = 132 cm

Total distance covered by the wheel = 792 m

1 m = 100 cm

Therefore, 792 m = 792 x 100 = 79200 cm

Then, the number of rounds of the wheel to cover the distance 79200 cm = 79200/132

= 600

Hence, the answer is (2) 600.