[tex]\bf so \begin{cases}
A=\textit{area of first desert}\\
B=\textit{area of second desert}\\
--------------\\
\textit{whatever long B is, A is 6 times that much}
\\\\
A=\boxed{6B}\\
--------------\\
\textit{now, their sum is }1,400,000\textit{ that is}
\\\\
A+B=1,400,000\implies \boxed{6B}+B=1,400,000
\end{cases}[/tex]
solve for "B" to see how long is the B desert,
now, what about desert A? or the first desert? well, is 6B :)
