the diameter of a wheel of a bus is 90cm which makes 315 revolution per minute. determine its speed in kilometres per hour. [use π =22/7]
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diameter of wheel = 90 cm
radius = d/2
= 90/2
= 45 cm
circumference = 2pie r
= 2x22/7x45
=282.85 cm
it covers in 315 revolution = 315x282.85
= 89097.75
1 metre= 100 cm
distance = 89097.75/100
= 890.9775
1 km = 1000 m
= 890.9775/1000
=.8909775 km
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