-
Diameter of a wheel is 3 cm. The wheel revolves 28 times in a minute. To cover 5.280 km distance, the wheel will take (Take π = 22/7) :
-
- 10 minutes
- 20 minutes
- 30 minutes
- 40 minutes
- 10 minutes
Correct Option: B
Using Rule 7,
Diameter of the wheel = 3 metres
∴ Circumference = π × diameter
| = | × 3 = | metre | ||
| 7 | 7 |
Since a wheel covers a distance equal to its circumference in one revolution, therefore, distance covered in 28 revolutions
| = | × 66 = 264 metre | |
| 7 |
Now, 264 metres distance is covered in 1 minute
∴ 5280 metres distance will be covered in
| = | = 20 metre | |
| 264 |
