C1m1(T-t)+c2m2(T-t)=c3m3(t-t0) 840*0.1(60-t)+4200*0.2(60-t)=250*0.08(t-10) 5040-84t+50400-840t=20t-200 55640=944t t=58.9 T0=60-58.9=1.1 Ответ: на 1,1С