Answer
$P_H/P_L=3.25$
Work Step by Step
$COP_{HP}=\dfrac{1}{1-\frac{T_L}{T_H}},\quad \frac{T_H}{T_L}=1.2$
$COP_{HP}=6.0$
$COP_{HP}=\dot{Q}_H/\dot{W}_i,\ \dot{W}_i=5\ kW$
$\dot{Q}_H=30.0\ kJ/s=q.\dot{m},\quad \dot{m}=0.22\ kg/s$
$q=136.36\ kJ/kg=\Delta h_v$
From table A-11:
$T_H=62.0°C=335\ K,\ P_H=1764\ kPa$
$T_L=291.4\ K=18.3°C,\ P_L=542\ kPa$
$P_H/P_L=3.25$
