V(D,W)=v , V(B,W)=u
V(D,B)=V(D,W)+V(W,B) = (v+u) (meke sapeksha prawegaya gannakota chalanaya wena disha salakanda one. ehema salakuhama thamai u+v wenne. mokada u and v prathiwirudda disha walata tiyenne)
bottuwata sapekshawa balla giya dura = 5m
mekata gathawana kalaya t nam...