Question 1015352
The area of a rectangle is 
{{{ A = h*w }}}
where {{{ A }}} = area in ft2
{{{ h }}} = height in ft
{{{ w }}} = width in ft
-------------------
I'll call the length of the runway {{{ h }}}, so
The area of the runway is {{{ A }}}, so
{{{ A = 1813500 }}} ft
The width of the runway is:
{{{ w = 150 }}} ft
------------------
{{{ A = h*w }}}
{{{ 1813500 = h*150 }}}
Divide both sides by {{{ 150 }}}
{{{ h = 1813500/150 }}}
{{{ h = 12090 }}} ft
The length of the runway is 12,090 ft