If the earth shrink such that its mass does not change but radius decreases to one

If the earth shrink such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take

Options

(a) 96 hours
(b) 48 hours
(c) 6 hours
(d) 1.5 hours

Correct Answer:

1.5 hours

Explanation:

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