Angle and travel time for torpedo to hit carrier 5 miles north

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rastakitty
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need help.. carrier 5 miles N of sub traveling E @ 3mins/hr. sub has torpedoe travel @ 40 knots. what is the angle and distance travel of torpedoe to hit carrier, what is travel time . with respect to original sighting
 
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pythagorean theorem gives quadratic equation in lengths. then diff lengths wrt t.