The shortest distance of AC is the distance when AC⊥BC, that is, = AB× SIN ∠ B = 300× SIN 30 = 150.
Location A starts at the typhoon center M and ends at N. ..
Influence distance mn? =? mc? +? North Carolina (USA)
Pythagorean theorem: mc? =? nc? =? 80
So mn? =? 160
So the time is 160? /? 20? =? 8? Hours,