After starting from the position marked with the $"x",$ a football receiver $B$ runs the slant$-$in pattern shown, making a cut at $P$ and thereafter running with a constant speed $v_B=6\mathrm{.}8y\frac{d}{sec}$ in the direction shown. The quarterback releases the ball with a horizontal velocity of $86f\frac{t}{sec}$ at the instant the receiver passes point $P.$ Determine the angle $$ at which the quarterback must throw the ball, and the velocity $v_{\frac{A}{B}}$ of the ball relative to the receiver when the ball is caught. Neglect any vertical motion of the ball.

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