A heater takes 40 minutes to boil a given amount \( \mathrm{P} \) of water. Its coil is cut and ...

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A heater takes 40 minutes to boil a given amount
\( \mathrm{P} \) of water. Its coil is cut and \( \frac{1}{4} \) th of its length is

W used in the heater now. How much time will it take now to boil the same amount of water using the same source?
(1) 10 minutes
(2) 12 minutes
(3) 15 minutes
(4) 8 minutes
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