Question

what will be the temperature of the mixture if one litre of water at 30'C is mixed with one litre of water at 50'C.

Answer 1

One liter of water = 30'C
One liter of water = 50'C

Answer 2

The bulk temperature will be warmer than
${39.99}^{o} c$
but cooler than
${40}^{o}c$