Question

A car makes 50,000 revolutions to travel a distance of 121 km. The diameter of the wheel of the car is

Answer 1

1 revolution=2 pi r =2*3.14*r=6.28*r

50,000 revolutions = 50,000 * 6.28 * r = 121

6.28*r = 12100000/50,000

r = 2.42/6.28 metres

r=0.38 metres

so, diameter = 0.38 * 2

diameter = 77 centimeters

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