The diameter of the wheel of a bus is 140cm. How many revolutions per minute the wheel
makes in order to keep a speed of 66km/hr?
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Step-by-step explanation:
D= 140cm
r= 70cm
C= 2πr
= 2× 22/7 × 70cm
= 440cm
Now distance travelled by the bus in 1 min
= s×t
= 66km/h × 1/60 h
=66km/60
= 1.1km or 1100m
No. revolution in 1100m= 1100m/circumference
= 1100×100cm/440cm
= 100×10/4
= 25×10
= 250
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