Four resistance 40   Ω , 60   Ω , 90   Ω 110   Ω and make the arms…

Four resistance $40 \Omega ,60 \Omega ,90 \Omega$ $110 \Omega$ and  make the arms of a quadrilateral $ABCD$. Across $AC$ is a battery of emf $40 V$ and internal resistance negligible. The potential difference across $BD$ in $V$ is __________