# Each wheel of a car is making 5 revolutions per second :

Each wheel of a car is making 5 revolutions per second. If the diameter of a wheel is 84 cm, then the speed of the car in cm/sec. would be

- 264 cm/sec
- 1320 cm/sec
- 1000 cm/sec
- 420 cm/sec

**Answer: (2) 1320 cm/sec**

**Explanation:-**

The diameter of a wheel = 84 cm

Then, the radius of the wheel = 84/2

= 42 cm

The perimeter of the wheel = 2 x 22 x 42/7

= 44 x 6

= 264

Then, distance covered by a car in a revolution = 264 cm

Therefore, distance covered by a car in 5 revolution = 264 x 5

= 1320 cm

Thus, the speed of the car in cm/sec will be 1320 cm/sec.

Hence, the correct answer is option (2) 1320 cm/sec.