By Helicopter.
The best way to travel from Paris to Toronto is by taking a direct flight. This is the fastest and most convenient option, with several airlines offering non-stop flights between the two cities.
Airplanes are the fastest way to travel a long distance. - Over short distances, some trains may be faster
Beacause it was the fastest and easiest way to travel.
Stagecoach.
By plane.
Train
Aeroplane in most cases, unless you're in Paris or Brussels.
wormhole
There are lots of ways of getting from Paris to Ireland. The simplest and fastest way is to fly. There are also ferries from France to Ireland, so you could travel to one of the ports where those ferries leave from. You could also travel to Britain and then to Ireland. You could use the Channel Tunnel to get to Britain and fly or go by ferry from there to Ireland.
Probably the train - Paris-Strasbourg is the world's fastest railway. The train goes on to Karlsruhe (3 hours from Paris) and a train from Karlsruhe to Heidelberg takes about another hour. Of course, one could fly in an hour and a half; but remember to allow 45 minutes to get to the airport, and the statutory 2-hour check-in for international flights, and time to get from the airport to the city centre.
The fastest and most effective way to travel to Ukraine from California is probably by aircraft.
going by experience it would be 'the metro' .