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A bicycle wheel of radius 35cm is making 25 revolutions in 10secs. At what speed in km/hr is the cyclle moving

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I rotation = 70π cm
25(70π) cm per 10 sec
6(25)(70π) cm per minute
60(6)(25)(70π)/100 m per hour
6300π m/hr
6300π/1000 km/h
= appr 19.8 km/h

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