Please write clear with steps:

One ship is approaching a port from the east, traveling west at 15 miles per hour, and is presently 3 miles east of the port. A second ship has already left the port, traveling to the north at 10 miles per hour, and is presently 4 miles north of the port. At this instant, what is the rate of change of the distance between two ships? Are they getting closer or further apart? Find the absolute minimum and maximum on the interval [0, 3] for: f(:1:)=x25x+3