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To go from town A to town B a plane must fly about 1780 km at an angle of 30^o West of North. How far north of A is B ?

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1452 km

1542 km

1254 km

11 km

answer is A.

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Detailed Solution

Along North, S_N = ’S’cos30^o
$S_{N} = 1780 \times \frac{\sqrt{3}}{2} = 890 \times 1.732 ≃ 1542 km$

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