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 480 m long train is running at a speed of 55 km / hr . it crossed a platform of length 620 m in ?
72 sec
11 minutes and 12 seconds.