A ship moves along the equator to the east with a velocity of \( 30 \mathrm{~km} / \) hour. The ....

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A ship moves along the equator to the east with a velocity of \( 30 \mathrm{~km} / \) hour. The south eastern wind blows
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at an angle of \( 60^{\circ} \) to the equator with a velocity of 15
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\( \mathrm{km} / \mathrm{hr} \). The wind velocity relative to the ship (take cos \( 60^{\circ}=0.500 \) and \( \left.\sin 60^{\circ}=0.866\right) \) is
(1) \( 35 \mathrm{~km} / \mathrm{hr} \) nearly
(2) \( 60 \mathrm{~km} / \mathrm{hr} \) nearly
(3) \( 40 \mathrm{~km} / \mathrm{hr} \) nearly
(4) \( 50 \mathrm{~km} / \mathrm{hr} \) nearly


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