Xavier and Ying are partners in a course project. Xavier is the project leader and thus is the first to decide how many hours, hx to put into the project. After observing the amount of time that Xavier contributes, Ying decides how many hours, hy to contribute. Xavier's utility function is Ux = 10 (hx + hy) 0.5 - hx. and Ying's utility function is Uy = 16 (hx +hy) 0.5 - hy. Ying threatens not to work on the project. How much time does Xavier contribute? Does Ying work on the project? Given Ying's threat, Xavier spends hx = hours on the project and Ying spends hy = hours on the project. (Enter numeric responses using integers.)