MATH QUESTION HELP....TRIGONOMETRY/SINE-COSINE LAW?

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From a position 110km northwest of a coast guard station, an oil tanker makes radio contact with the coast guard. The tanker is travelling due south at 25km/h. The radar unit at the coast guard station has a range of 90 km. For what length of time can the coast guard expect the tanker to be visible on the radar screen, to the nearest tenth of an hour ?

detailed explanations plz
 
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