A basketball​ player's hang time is the time spent in the air when shooting a basket. The formula [tex]t= \frac{ \sqrt{d} }{2} [/tex] models hang​ time, t, in​ seconds, in terms of the vertical distance of a​ player's jump,​ d, in feet. When a particular player dunked a​ basketball, his hang time for the shot was approximately 1.09 seconds. What was the vertical​ distance, d, of his​ jump, rounded to the nearest​ tenth?