Probably a lot more than a train ticket.
It's about 210 Kms and take at least 2 hrs 30 mins by car.
You can find taxi prices for France at - www.taxis-de-france.com
Click on 'Tarifs Taxis' to find how much they charge per kilometre depending on time of day or night, standard charges and extras for such items as luggage, parcels, animals(?) and fourth passenger.
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