The radius of the wheel of the truck is 70cm. It takes 250 revolution per minute. Find the speed of the truck is km/hr.
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r =70/2=35
p =2πr =2×22/7×35 =2×22×5 =220
220 cm in one revolution
in 250 revolution =220 ×250 =55000
1min = 55000cm
60 min =55000×60=3300000cm
3300000cm =3300000/1000 = 3300 km
then speed of truck =3300km/hour
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