A Coffee Cup Calorimeter Contains 525

A coffee cup calorimeter contains 525.0 grams of water at 25.0 °C. To it are added: 350.0 grams of water at 48.3 °C
480.0 grams of water at 63.8 °C Neglecting the heat absorbed by the coffee cup, calculate the final temperature of the water. The specific heat of water is 4.184 J g^-1 °C^-1.Hint: Take this problem one step (one water addition) at a time.

A) 39.6 °C
B) 45.7 °C
C) 44.8 °C
D) 66.7 °C
E) 92.4 °C