The pressures at `A` and `B` in the atmosphere are, respectively,

Options

A. `(sigma_(1)V_(1)+sigma_(2)V_(2))/((sigma_(1)//L_(1))+(sigma_(1)//L_(2)))`
B. `((sigma_(1)V_(1))/(L_(1))+(sigma_(2)V_(2))/(L_(2)))/((sigma_(1)//L_(1))+(sigma_(1)//L_(2)))`
C. `((sigma_(1)//V_(1))+(sigma_(2)//V_(2)))/(sigma_(1)V_(1)+sigma_(2)V_(2))`
D. `(sigma_(1)V_(1)-sigma_(2)V_(2))/((sigma_(1)//L_(1))-(sigma_(1)//L_(2)))`

Answer

B