The diameter of the wheel of a car is 70 cm. how many revolutions will it take to travel 1.65 km?
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1.65 km = 1.65 ×1000×100 cm
= 165000 cm
now,radius = diameter/2
= 70/2
=35 cm
now, circumference = 2π r
= 2×(22/7)×35
= 220 cm
it means, 220 cm = 1 revolution
then, 165000 cm = 165000/220
= 750 revolution
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