Establish a plane coordinate system with the base as the coordinate origin, the due east as the X axis and the due north as the Y axis.

When a missile hits an enemy ship, they are at the same distance in the X direction. Because the automatic missile system enables the missile to aim at the enemy ship at any time, the missile speed is decomposed into X direction and Y direction, the X direction speed is 90km/h, so the Y direction speed is 440.908 km/h. ..

1). Establish the corresponding relationship between missile flight trajectory (x, y) and time, which can be established according to their respective speeds.

2). The hit time is 120km divided by the speed in the Y-axis direction, and the position is the sum of the squares of the distance in the X-direction and the distance in the Y-direction. Note that the units are h and km.