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`200g` of water and a equal volume of another liquid of mass `250g` are placed in turn in the same calorimeter of mass `100g` and specific heat capacity `420J kg^(-1) K^(-1)`. The liquids which are constantly stirred are found to cool from `60^(@)C` and `20^(@)C` in `180s` and `140s` respectively. Find the specific heat capacity of the liquid. The temperature of the surroundings `=20^(@)C`

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