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A colorimeter contains 400 g of water at...

A colorimeter contains `400 g` of water at a temperature of `5^(@)C`. Then, `200 g` of water at a temperature of `+10^(@)C` and `400 g` of ice at a temperature of `-60^(@)C` are added. What is the final temperature of the contents of calorimeter?
Specific heat capacity of water `-1000` cal`//kg//K`
Specific latent heat of fusion of ice `=80xx1000` cal`//kg`
Relative specific heat of ice `=0.5`

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