we don't know the exact #
estimate 52.6% or less...
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45mph
Different countries in Europe have different laws governing road use. Furthermore, within each country, there are different laws for different types of roads. Also, the speed limits on some roads, in some countries are also adjusted according to the weather (lower speed limits in rain, for example).
The general relation is the following: distance = speed x time
In the UK it is 60 miles per hour. That is the speed you can go on roads that have the white circle roadsige with the black diagonal. Other roads have different posted speeds, some faster, some slower (motorways 70 mph, urban areas 30 mph).
In the case of constant speed: distance = speed x time. Or, Total distance = Average speed * Total Time