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Hot cold fluids enter a parallel flow double tube heat exchanger at $100^{\circ}C$ and $15^{\circ} C$, respectively. The heat capacity rates of hot and fluids are $C_h=2000 \: W/K$ and $C_c =1200 \: W/K$, respectively. If the outlet temperature of the cold fluid is $45^{\circ} C$, the log mean temperature difference (LMTD) of the heat exchanger is _______ $K$ (round off to two decimal places).

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