Can anyone help me with this algebra question?

Brad tossed a baseball in the air from a height of 6 feet with an initial upward velocity of 14 feet per second. Enrique caught the ball on its way down at a point 4 feet above the ground. How long was the ball in the air before Enrique caught it? Use the equation h=-16t^2+vt+s where 'h' is height in feet, 't' is time in seconds, 'v' is the initial upward velocity in feet per second, and 's' is the initial height in feet. (let h=0)