use the scale2D command (via menus --- transform -> scale -> scale 2D)
for the origin prompt, click on the left side of the drawing's scale.. (or other known dimension in the drawing but since this one has a scale on there…)
for the "scale factor or first reference point" prompt, click on the right side of the scale
at the next prompt, type 10m <return>
your drawing will scale accordingly
Thanks so much! I may come back at you with some more questions, really helpful.