Diameter of a car wheel is 21 cm. A car driver moving at the speed of 66 km/hr takes 36 seconds to reach a destination. How many revolutions will the wheel make during the journey? ?->(Show Answer!)

1. Diameter of a car wheel is 21 cm. A car driver moving at the speed of 66 km/hr takes 36 seconds to reach a destination. How many revolutions will the wheel make during the journey?

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By: anil on 05 May 2019 02.03 am

Diameter of wheel = 21 cm => Circumference of wheel = Distance travelled in 1 revolution = $$2pi r$$ = $$2 imesfrac{22}{7} imesfrac{21}{2}=66$$ cm Speed of car = 66 km/hr = $$(66 imesfrac{5}{18})=frac{55}{3}$$ m/s Total distance travelled by car = $$frac{55}{3} imes36=660$$ m = $$66000$$ cm $$ herefore$$ Total revolutions taken by the wheel = $$frac{66000}{66}=1000$$ => Ans - (D)

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