Answer
$\dot{V}=0.850\ L/s$
Work Step by Step
$\eta = \dot{W}_e/\dot{Q}_H$
$\dot{W}_e=6000\ kJ/s$
$\dot{Q}_H=28570\ kJ/s=q.\dot{m},\quad q=42,000\ kJ/kg$
$\dot{m}=0.6803\ kg/s=\rho.\dot{V},\quad \rho=0.8\ kg/L$
$\dot{V}=0.850\ L/s$
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