Three liquids P, Q and R having same specific heat and mass \(m , 2 m\) and \(3 m\) have tempera....

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Three liquids P, Q and R having same specific heat and mass \(m , 2 m\) and \(3 m\) have temperature \(20^{\circ} C , 40^{\circ} C\) and \(60^{\circ} C\) respectively. Temperature of the mixture when:
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