c=4185 J/kgK
V=300 l=0,3 mĀ³
Ļ=1000 kg/mĀ³
Qced=māc(tā-Q)
Qprim=māc(Q-tā)
Qprim=Qced<=>māc(tā-Q)=māc(Q-tā) |:c=>mā(80-40)=mā(40-12)<=>40mā=28mā|:40=>mā=0,7mā
Ļ=m/V=>m=ĻV=1000*0,3=300 kg
m=mā+mā=mā+0,7mā=1,7mā=>mā=m/1,7=300/1,7=176,46 kg
mā=0,7mā=0,7*176,46=123,54 kg
Vā=mā/Ļ=176,46/1000=0,17646 mĀ³=176,46 l->apa rece
Vā=mā/Ļ=123,54/1000=0,12354 mĀ³=123,54 l->apa calda