How fast Is 25000 cc?

Answer 1

It's not possible to answer the question. "cc" is a measure of volume, not of velocity. You may mean "how fast is an engine with a displacement of 25000 cc", which is also not answerable because it depends on the construction of the engine, what it's moving, and how the motive power is transferred from the engine to the driving devices (wheels, propellers, whatever).

Incidentally, 25000 cc is a HUGE engine by the standards of most personal vehicles. 250 cc is a more reasonable size for a motorcycle, 2500 cc (2.5 liters) is a fairly common engine size for small-to-midsize cars, and a large farm tractor might contain a engine with a displacement of 10 liters (10000 cc) or so.