physics

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A bicycle has wheels 67.3 cm in diameter and pedal cranks 17.5 cm long. The cyclist pedals at a steady cadence of 76.0 rev/min. The chain engages with a front sprocket 15.2 cm in diameter and a rear sprocket 7.00 cm in diameter.
Calculate:
a) the speed of a link of the chain relative to the bike frame
b) the angular speed of the bike wheels
c)the speed of the bike relative to the road

um, i'm pretty confused on what to do here...

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