A given object takes 3 times as much time to slide down a \( 45^{\circ} \) rough incline as it t...

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A given object takes 3 times as much time to slide down a \( 45^{\circ} \) rough incline as it takes to slide down a perfectly smooth \( 45^{\circ} \) incline. The coefficient of friction between the object and the incline is :
(A) \( 1 / 8 \)
(B) \( 8 / 9 \)
(C) \( 1 / 2 \sqrt{2} \)
(D) \( 2 \sqrt{2} / 3 \)
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