A ball is thrown upward from the top of a 140 ft. tall building.  If the initial speed of the ball is 15 ft.  per second, then the equation   h  =  140 + 15t − 16t2   gives the height of the ball above the ground   t   seconds after it is thrown.  After how many seconds will the ball hit the ground? (Round your answer to the nearest hundredth of a second.)

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