Two ships, A and B, leave port at the same time. Ship A travels northwest at 29

Question

Two ships, A and B, leave port at the same time. Ship A travels northwest at 29 knots and ship B travels at 38 knots in a direction 40° west of south. (1 knot = 1 nautical mile per hour; see Appendix D.)

(a) What is the magnitude the velocity of ship A relative to B?
49.77 knots

(b) What is the direction of the velocity of ship A relative to B?
4.517 degrees east of north

(c) After what time will the ships be 115 nautical miles apart?
2.3106 hours

(d) What will be the bearing of B (the direction of B's position) relative to A at that time?
???? degrees west of south


How do you get D. The textbook answer guide on this website says 180 degrees, however its wrong.. Also, 0 degrees counts as wrong too.

Explanation / Answer

The angle between the direction of ship A relative to ship B and the direction of ship B relative to ship A is 180 deg. So the direction of velocity of ship A relative to B is 4.517 deg east of north then the direction of the B's position relative to A is also 4.517 deg west of south.

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