A cyclist moves with your bike straight

A bike moves at a rate of 18 km/h\si{18\ \kilo\meter/\hour}. The rear tire has a diameter of 70 cm\si{70\ \centi\meter} and has a toothwheel of diameter 7 cm\si{7\ \centi\meter}. The sprocket (the gear that's turned by the pedals) has diameter 20 cm\si{20\ \centi\meter}. Both gears are connected by the chain and there is no slippage between the chain and either gear. Under these conditions, how many times do the pedals revolve per minute?

In this matter, assume π=3\pi = 3.

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