Trishaa starts walking from point A, moves 12 m south to reach point B. She then turns left and walks 7 m to point C. Next, she turns left again and w...

Trishaa starts walking from point A, moves 12 m south to reach point B. She then turns left and walks 7 m to point C. Next, she turns left again and walks 5 m to point D. From point D, she turns left and walks 11 m to reach point E. Point P lies to the west of point B. Rishi, standing at point P, walks a distance equal to the shortest distance between points B and E to reach point Q. From point Q, he turns left, walks some distance, and arrives at point E.

Mehul starts walking south from point B and reaches point K after walking a certain distance. He then turns left, walks 10 m, takes another left turn, and walks 9 m to stop. If Mehul's final position is 3 m east of point D, what is the distance between points B and K?