Cycling physics

A student of mass 75 kg rides a bicycle of mass 25 kg. The student has a habit of standing on the paddle, one leg at a time, so that the force of his weight drives the bicycle. Distance between the top and the bottom positions of the pedal is 20 cm. Ratio of the paddle wheel (bigger) and the gear (on the rear wheel) is 10. Radius of the rear wheel of the cycle is 50 cm. the student takes 6 seconds for one full pedal (both the legs) and spends only that much energy so that the cycle runs continuously with constant velocity. Calculate the kinetic energy (in joules) of only the cycle during this uniform motion. Round to the nearest integer.