Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: a train is running at a speed of 40 km / hr and it crosses a post in 16.2 seconds . what is the length of the train ?
160 metres
240 meters.