මේ වගේ ගණන් හදන්නෙ කොහොමද?

[bootboy]

ko mahaloku kaiwaru gahana ewun awilla terenne mekata uththarayak dennako hitha hitha inne nathuwa..

 

[Sathyajithsr]

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 t=5/V(D,B)---> t=5/(v+u)-------------1

gamyathawayen 15v=30u----> v=2u--------------------2

me t kalaya thula bottuwa yana dura = V(B,W)*t = ut =u* (5/(u+v)) = 5/3

Balla inna thanata iwure indan mulu dura = kalin bottuwe kerawalata tibba dura + bottuwa giya dura = 10+ 5/3 m = 11 2/3 m

correct