Question

The diameter of the wheel of a car is 70 cm . How many revolutions will it make to travel 1.65 km ??

Answer 1

is Ace
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

Answer 2

hey
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distance covered in revolution = circumference of the wheel

circumference of wheel = 2πr

r = 70/2 = 35 cm

2πr
= 2×22/7×35
= 44/7×35 cm
= 44×5 cm
= 220 cm = distance covered in 1 revolution

220 /100 m
22/10 m
22/10×1000 km

22/10000 km in 1 revolution
1.65 km in 1.65×10000/22 revolution = 750

hence 750 is the ans

hope helped
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