The radius of the wheel is 21 cm. When the wheel rotates once, the distance covered by the car is 2*pi*21.

As the wheel rotates at 800 RPM, it covers a distance equal to 2*pi*21*800 cm per minute.

The distance covered in one hour is 2*pi*21*800*60/100 m

=> 20160*pi m

=> 20.16*pi km

=> 63.33 km (approximately)

**The required speed of the car is 20.16*pi or 63.33 km/hr**.

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