A particle p moves from the point A(0,4) to the point (10,−4). The particle P can travel the upper-half plane {(x,y)|y≥0} at the speed of 1 m/s and the lower-halfplane{(x,y)|y≤0} at the speed of 2 m/s. The coordinates of a point on the x-axis, if the sum of the squares of the travel times of the upper- and lower-half planes is minimum, are