The image shown has two triangles sharing a vertex: What is the measure of ∠KML, and why?

y over 2 , because Triangle JHK is congruent to triangle LMK
y + 50 degrees, because Triangle JHK is similar to triangle MLK
115 degrees - y, because Triangle JHK is congruent to triangle LMK
y, because Triangle JHK is similar to triangle LMK