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After what time will the ships apart

Two ships, A and B, leave port at the same time. Ship A travels northwest at 21 knots and ship B travels at 30 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?

(b) What is the direction of the velocity of ship A relative to B?

(c) After what time will the ships be 155 nautical miles apart?

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

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