Assertion: stairwell's floor | /r/HasProperty | 870 km/h
Facets:
Source sentences:
text: Seventeen minutes later, United Airlines Flight 175 approached from the southwest, over New York Harbor, and crashed into the south facade of the South Tower (WTC 2) at 9:02 am between the 77th and 85th floors at 540 miles per hour (870 km/h).