The counter from which Andy/Tommy, Jeremy/Sandy and Justin/Jennifer got their tickets listed its destination as Mo Chit (Northern) Terminal, but the places where each team got their taxi don't make too much sense. Andy/Tommy look like they boarded at the Mo Chit Skytrain Station, which is the closest station to the bus terminal but still more than a kilometre away as the crow flies. Jeremy/Sandy and Justin/Jennifer board their taxi in a place that looks nothing like Mo Chit.
We see Justin/Jennifer waiting, at 7.32am, at the lower level of the Siam Station
interchange, which serves trains towards Wong Wian Yai or On Nut. The pair only check in at 9.35am, so we know they're headed from Mo Chit to the fishes, and not from there to the Pit Stop. That eliminates On Nut as a possibility (since going that way from Mo Chit doesn't require a change at Siam Station), meaning Justin/Jennifer are headed towards Wong Wian Yai.
We can assume they took the metro to save money, but where did they alight? Each station they take on the line takes them further away
from the fishes... And what about Jeremy/Sandy, considering they arrive at the fishes the same time as Andy/Tommy, who presumably took a taxi straight from Mo Chit?