Diameter of wheel of a cycle is 21 cm. The cyclist takes 45 minutes to reach a destination at a speed of 16.5 km/hr. How many revolutions will the wheel make during the journey? ?->(Show Answer!)

1. Diameter of wheel of a cycle is 21 cm. The cyclist takes 45 minutes to reach a destination at a speed of 16.5 km/hr. How many revolutions will the wheel make during the journey?

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By: anil on 05 May 2019 01.46 am

Speed of cyclist = 16.5 km/hr , => In 60 minutes he covers = 16.5 km => In 45 minutes he covers = $$frac{16.5}{60} imes45=12.375$$ km = $$1237500$$ cm Radius of cycle = $$frac{21}{2}$$ cm Distance covered in 1 revolution = $$2pi r$$ = $$2 imesfrac{22}{7} imesfrac{21}{2}=66$$ cm $$ herefore$$ Number of revolutions made by the wheel in the journey = $$frac{1237500}{66}=18750$$ => Ans - (B)

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