The distance between the above mentioned places is 219.8 miles approximately. The distance is straight path from one place to another place. There might be slight difference between the actual distance and the above mentioned distance because of the route chosen.
30 miles
About 450 miles
About 150 miles.
As far as I know there is no ferry service between Dover and Belgium anymore. From Dover you have a ferry to Calais in France.
22 miles
about 390km
About 280 miles.
By road, 77.2 miles.
About 100 miles
54 miles
5049 mi
I believe about 40 miles.