Figure shows two ships moving in x y-plane with velocities v_A and v_B. The ships move such that ...

Figure shows two ships moving in x y-plane with velocities v_A and v_B. The ships move such that B always remains north of A. The ratio v_A/v_B is equal to
(a) cosθ
(b) sinθ
(c) θ
(d) cosecθ

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