I am bored of the Basics!

A liquid cools from $$70$$ degree Celsius to $$60$$ degree Celsius in 5 minutes. Calculate the time taken by the liquid to cool from $$60$$ degree Celsius to $$50$$ degree Celsius, if the temperature of the sorrounding is constant at $$30$$ degree Celsius.

Please input the time in $$minutes$$.

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