2 kg water at  ${100}^{o}C$  and 2.5 kg water at ${50}^{o}C$   is kept in two identical containers A and B respectively of water equivalent 0.5 kg. If water of container A is poured into container B the final temperature of mixture is ${\text{T}}_{\text{1}}$  and if water of container B is poured into container A the final temperature is ${\text{T}}_2$  . (Heat loss is negligible)