Two ships, a and b, leave port at the same time. ship a travels northwest at 15 knots and ship b travels at 20 knots in a direction 40° west of south. (1 knot = 1 nautical mile per hour) (a) what is the magnitude the velocity of ship a relative to b? knots (b) what is the direction of the velocity of ship a relative to b? ° east of north (c) after what time will the ships be 160 nautical miles apart? h (d) what will be the bearing of b (the direction of b's position) relative to a at that time? ° west of south