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One litre of water at 30^@C is mixed wit...

One litre of water at `30^@C` is mixed with one litre of water at `60^@C`, the temperature of the mixture will be

A

`90^@C`

B

`gt 60^@C" but " lt 90^@C`

C

`30^@C`

D

Between `30^@C & 60^@C`

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