Determine the final Temperature of the room - Thermodynamics

A student living in a 3-m x 4-m x 4-m dormitory room turns on her 100-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and windows are tightly closed and disregrading any heat transfer through the walls and the windows, determine the temperature in the room when she comes back 8 hours later. Use specific heat values at room temperature and assume the room to be at 100 kPa and 20 degrees celcius in the morning when she leaves.

[政霖余-cv]

T2 = Q/m·cv + T1.
You bring the wrong number (288kJ) to Q.

[badgerfactory]

Can’t understand the accent is too string