If the earth shrinks such that its mass does not change but radius decreases to one quarter of i...

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If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take
[WB-JEE 2008]
(a) \( 96 \mathrm{hrs} \)
(b) \( 48 \mathrm{hrs} \)
(c) \( 6 \mathrm{hrs} \)
(d) \( 1.5 \mathrm{hrs} \)
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