Q13 of 19 Page 191

Road roller makes 5000 revolutions in covering 22 kilometer’s. Find the radius of the roller.

Given:


Distance covered by roller = 22 km


Revolutions made by roller = 5000


let the radius of the roller be x


Circumference of roller = 2πr


According to given conditions


5000 × 2πr = 22000




r = 70 cm


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