Question 1185379
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Let the height be x.<br>
The surface area of 6200m^2 consists of two faces of x by 20, two of x by 30, and two of 20 by 30:<br>
{{{2(20x)+2(30x)+2(20*30)=6200}}}
{{{40x+60x+1200=6200}}}
{{{100x=5000}}}
{{{x=50}}}<br>
The height is 50m; then the volume (in m^3) is length times width times height.<br>