SOLUTION: The wheels of a car are of radius 40 cm each. If the car is travelling at a speed of 66 km per hour, find the number of revolutions made by each wheel in 20 minute.

Algebra ->  Volume -> SOLUTION: The wheels of a car are of radius 40 cm each. If the car is travelling at a speed of 66 km per hour, find the number of revolutions made by each wheel in 20 minute.       Log On


   

Question 913216: The wheels of a car are of radius 40 cm each. If the car is travelling at a speed of 66 km per hour, find the number of revolutions made by each wheel in 20 minute.
Answer by mananth(16946) About Me  (Show Source):
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The wheels of a car are of radius 40 cm each. If the car is travelling at a speed of 66 km per hour, find the number of revolutions made by each wheel in 20 minute.

distance traveled by car in 1 revolution = 2*pi*r = 80 pi cm
no of revolutions in 1 hour 66*1000*100 cm/80 pi = 82500 pi
No of revolutions per 20 minutes(1/3 ) hr = 1/3 * 82500 pi =863938