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The diameter of each wheel of a car is 70 cm. If each wheel rotates 400 times per minute, then the speed of the car (in km/hr) is (Take π= 22/7)
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- 0.528
- 528
- 52.8
- 5.28
- 0.528
Correct Option: C
Using Rule 7,
Circumference of the wheel of car = π × d
| = | × 70 = 220 cm | |
| 7 |
= Distance covered in one rotation
∴ Distance covered by car in 1 minute = (400 × 220) cm.
∴ Distance covered by car in 1 hour = (400 × 220 × 60) cm.
| = |  |  | km. | |
| 1000 × 100 |
= 52.8 km.
∴ Speed of car = 52.8 kmph
