The army of a country launches a test rocket from a base. The rocket's height h(t)=1/10t^2+30, where t is the time in seconds From a satellite in space, a laser is fired at the rocket to attempt to destroy it. The laser is fired at the correct time along the lines Y=-2t+15. Determine the number of seconds, to the nearest 10th of a second, into the flight that the rocket is destroyed