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An electric bettle has two coils. When o...

An electric bettle has two coils. When one coil is switched on it takes 15 minutes and the other takes 30 minutes to boil certain mass of water. The ratio of times taken by them, when connected in series and in parallel to boil the same mass of water is :

A

`1:3`

B

`5:2`

C

`7:3`

D

`9:2`

Text Solution

Verified by Experts

The correct Answer is:
D
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