Originally Posted by
Goldorak
I think you will have one ticket for the tram and one for the whole train ride.
PS : I admire you to do all this with public transportation (I would have jumped in a Uber
. Schedule ample time. It will be a long trip
Should take about 1H30. About 1/4 hr for the tram ride and 1H1/4 for the RERC+RERB ride. An alternative would be bus 379 to Croix de Berny and RER B direct from there. Should take about the same time.