Easy!
Using Q = mc(delta)
where delta = difference between final and initial temperature
Given m = 47 kg
Q = 3.40 X 10^2 kJ
Since heat is being absorbed into the system, this is an endothermic reaction.
c for water is 4.2 kJ/kg.C
Substituting Q,m,c & initial temperature of water into the equation.....
The final temperature is 23.2 degree C