answer: #Person1# and #Person2# agree to allow three hours to cover the distance to London and talk about #Person2#'s company car's maxium speed over 200 kllometers an hour.
documents: #Person1#: how long will it take us to drive to London?
  #Person2#: I think it ' s a distance of 180 kilometers from here to London, so it should be a two-hour drive on the motorway.
  #Person1#: that ' s unless there is a traffic jam. It could take three hours.
  #Person2#: you ' re right. We will be able to travel at high speeds at the beginning and end of the journey, because we will be in built-up areas.
  #Person1#: so, shall we allow three hours to cover the distance?
  #Person2#: ok. You haven ' t seen my company car, have you?
  #Person1#: no. let me take a look... it ' s longer than my car.
  #Person2#: I think it ' s over five meters long. I can ' t remember exactly. It has a maximum speed of over 200 kilometers an hour.
  #Person1#: wow! That ' s fast! I don ' t think we will be traveling that fast on the motorway.
  #Person2#: we can ' t. if we went that fast, we would break the speed limit.