Hello all!

Here I am again with another question...

Look at the drawing I made. The bathtub discharge into a pipe into which the shower is also discharging. All fixture is properly vented.

Say there is a blockage between the shower and the stack, will the bathtub overflows inside the shower stall?

If there is no blockage, is there a chance that the bathtub overflows inside the shower stall as water travels inside the drain pipe?

Thanks for your time and patience!