# The wheels of a car make 2500 revolutions in covering a distance of 4.95 km. Find the diameter of a wheel.

Let the diameter of the wheel be ‘d’ cm

Total distance covered in 250 revolutions = 49.5 km = 495000 m

Distance covered in one revolution = 198 cm eqn1

Also, Distance covered in one revolution = circumference of wheel

Distance covered in one revolution = πD where d = diameter of wheel

Equate equation 1 and 2 we get,

d = 9×7

d = 63 cm

The diameter of the wheel is 63 cm.

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