As a volunteer for the Boys and Girls Club, you and your fellow volunteers have been asked to help the students complete a model rocket project. Your plan is to fire the model rockets from the top of the building (175 ft tall) so that the rockets will clear the nearby trees. Neglecting air resistance, each rocket's height s (in feet) can be modeled with the equation s=−16t2+670t+175 where t is time (in seconds). Determine at what time the rockets will land so that your fellow volunteers can collect them and return them to the kids. Round to the nearest hundredth.