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can someone please tell me how fast a 50cc mini motor or motorbike goes and how fast a 10cc goes and so on please thankyou

 
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That's not quite how it works, it's more about power than speed and it also depends on things like whether you've a two or four stroke engine. Generally though you'll find 50ccs such as little scooters or mopeds are restricted to do anything between 30 and 50mph. 125cc, you're looking at a top (comfortable) speed of 70mph with a four stroke engine. It doesn't directly translate though, you're looking at a fair few factors. (For mini motos you're looking at 40mph tops)

 
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With the proper modification the 50cc bike can go as fast as the 100cc bike. But the life span of the modified 50cc wouldn't last as that of the 100cc bike under extreme riding. That means when you're riding at the speed of 100kph everyday, the 100cc would last longer. It goes to show that the bigger the engine the lesser strain it has at 100kph.Without modification to the 50cc, the comparison between the two is simply the 100cc is twice as much as that of the 50cc.