But can't even begin to work out of it's calculable.

Google can't help me here so hive mind to the rescue.

So, if you're standing on a railway platform and a train, that is exactly one mile long zooms past you. It takes exactly 5 seconds to pass you.

Therefore how fast is travelling in miles per hour?

Something tells me this is solvable but I could be wrong. I'm terrible at maths.