Answer
$26km^2*2.0in=(26\times1000^2)m^2*(2.0*0.0254)m=1.3\times10^6 m^3$
$m=pv=(1\times10^3) *(1.3\times10^6)=1.3\times10^9 kg$
Work Step by Step
Volume equals to base area*height.
Convert the unit to meter by using 1000m=1km and 1in=0.0254m
p=m/v which gives us the formula of m=pv.
Density of water is writing as kg/m$^3$.
