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A bicycle wheel makes 5000 revolutions in moving 11km.Then the radius of the wheel (in cm) is (Take π = 22/7 )
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- 70
- 35
- 17.5
- 140
- 70
Correct Option: B
Using Rule 7,
Distance covered by wheel in one revolution =
| Circumference of wheel = | = | metre | ||
| 5000 | 5 |
| = | × 100 cm = 220 cm | |
| 5 |
∴ 2πr = 220
| ⇒ 2 × | × r = 220 cm | |
| 7 |
| ⇒ r = | = 35 cm | |
| 2 × 22 |
