A candle of diameter d is floating on a ...

A candle of diameter `d` is floating on a liquid in a cylindrical container of diameter `D(D lt lt d)` as shown in figure. If is burning at the rate of `2 cm//h` then the top of the candle will :

remain at the same height

fall at the rate of `"1 cm/hour"`

fall at the rate `"2 cm/hour"`

go up at the rate of `1" cm/hour"`

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