The diameter of a wheel of a bus is 90 cm. How many revolutions will it make to travel 110 km?
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>>The diameter of a wheel of a bus is 90 c
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The diameter of a wheel of a bus is 90 cm which makes 315 revolutions per minute. Determine its speed in kilometer per hour. (Use π=
7
22
)
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Solution
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Verified by Toppr
⇒ Diameter of wheel =90cm
⇒ Radius of wheel (r)=
2
90
cm=45cm
⇒ Distance covered in 1 revolution =2πr
⇒ Distance covered in 1 revolution =2×
7
22
×45=
7
1980
cm
⇒ Distance covered in 315 revolutions =
7
1980
×315=89100cm=891m
⇒ Hence, the speed is 891m/min=
1000
891
×60km/hr=53.46km/hr
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