A ship is steering on a heading of 65° relative to true north at a speed of 18 knots (nautical miles per hour), and there is a northwesterly current moving at a speed of 3 knots. What is the resultant speed and direction of the ship?
a. 17.2 knots, heading 55.6°
b. 19.2 knots, heading 73.4° (INCORRECT)
c. 17.2 knots, heading 34.4°
d. 15.2 knots, heading 68.9° (INCORRECT)