Question

the wheel of a car of radius 40cm each. if the car is traveling at a speed of 66 km per hour,find the number of revolution made by each wheel in 20 minutes

Answer 1

radius =40cm
then distance travelled by the car in one revolution =2πr
=2π40  =80πcm
no. of revolutions in one hour =100*1000*66cm/80π(change 66km/hr to 66cm/hr)
(calculate to get the answer)
then divide the answer by three to get the answer for 20 minutes

Answer 2

Answer:

8750

Step-by-step explanation:

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 =8750