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Q=m.c.(T2-T1)
7200=0,2×2400×(T2-24)
7200=480(T2-24)
7200=480T2-11.520
18.720=480T2
T2=18.720/480
T2=39
Q= 0,2X2400(tt-24
7200=0,2x2400 (tt-24)
7200=480(tt-24)
720=48tt-1152
720+1152=48tt
tt=720+1152 : 48
tt=39