The $2200-1$b load $P$ may be moved along the beam $BD$ to any position between stops at $E$ and $F.$ Knowing that ${}_{\text{a}\text{l}\text{l}}=6$ ksi for the steel used in rods $AB$ and $CD,$ determine where the stops should be placed if the permitted motion of the load is to be as large as possible.

The positions of the stops are as follows:

$x_E=in.$

$x_F=in.$