Need help with calc

One ship is sailing north at the rate of 18 miles per hour. At the same time, the second ship, 250 miles north of the first ship, sails east at the rate of 24 miles per hour. What is the rate of change in their distance at that moment? Find the point on the line x +y - 5 closest to the origin. Answer in the form (X, y). By the Fundamental theorem of calculus, the derivative ( S. cost ( viz + 5sint + 6) at is 4cos3(v x2 + 5sinx +6) 4cos(v x2 + 5sinx + 6)(-sin(v x2 + 5sinx+6))(- 2x + 5cosx 2vx +5sinx +6 4cos3(v x2 + 5sinx +6)(- 2x + 5cosx 2V x2 + 5sinx +6 cost(v x2 + 5sinx+6)