Could a bull shark kill a piranha?

A crocodile will not last long under water since it will have to go to the surface to get some air...

A bull shark doesnt need to go to the surface to get air.

The fight will not take long since the crocodile will most likely try to go to the surface and get some air the crocodile attack would be ferocious but limited the bull shark all it has to do is bite and hold onto the crocodile until it drowns it.