It varies with your route, but on average it should be about a 2 hour and 30 minute drive.
They can, but they will have a hard time! Driving a car in Brussels is not for the weak hearted :p
Brussels Center Crown offers car rentals in Brussels. Auto Europe also offers car rentals in Brussels. You can go online to their websites and they will give you a quote on their fees to rent a car that will help you see the sites in a city that has many sites to see from cobbled streets to quaint road side cafes.
Around one hour by car. There are also public transports : www.sncb.be
There are plenty of companies that offer car hire services in Brussels. Its been mentioned that 'avis' is a great company to hire a car from. They are located in Brussels.
Train or Car.
Some companies that offer car hire in Brussels include: Rental Cars, Booking Buddy, Economy Car Rentals, Europcar, Kayak, Hertz, Sixt and Firefly Car Rental.
about 2000 KM or roughly 20 hours by car (assuming you mean Brussels, Belgium)
Traveling by car from Hanover Airport in Hanover, Germany, it will take approximately 3 hours and 45 minutes.
Train or maybe car
By train: Eurostar high speed trains go from Brussels Midi station to London St Pancras in less than 2 hours. If you really want to drive by car: take the E40 in the direction of Gent - Brugge - Oostende up to Calais. From there take the Shuttle (ride your car on a train, the train goes through the tunnel under the Canal) so you arrive in Dover. From there take the M20 going on to the A20 right to London.
about 3 hours by car.
by car (Utrecht, Eindhoven, Maastricht)