The highest speed ever achieved on a bicycle was reached by John Howard of the United States. The bicycle, which was accelerated by being towed by a vehicle, reached a velocity of +245km/h. Suppose Howard wants to slow down, and applies the breaks on his now freely moving bicycle. If the average acceleration of the bicycle during braking is -3.0 m/s^, how long will it take for the bicycles velocity to decrease by 20.0 percent?