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प्रश्न
The diameter of a cycle wheel is `4 5/11` cm. How many revolution will it make in moving 6.3 km ?
उत्तर
Diameter = `4 5/11` cm = `49/11` cm
circumference = 2 π r = π d
`= 22/7 xx 49/11`
= 14 cm
Circumference= 14 cm = 0.14m
Distance travelled = 6.3 km = 6300 m
No. of revolutions = `6300/0.14 = 45000`
Wheel takes 45000 revolutions in moving 6.3 km
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