Answer:
One World Trade Center (WTC 1, or the North Tower) was hit at 8:46 a.m. Eastern time and collapsed at 10:28 a.m. Two World Trade Center (WTC 2, or the South Tower) was hit at 9:03 a.m. and collapsed at 9:59 a.m.
How long did it take for the south tower to collapse?
56 minutes
9:57: The passengers aboard Flight 93 begin a revolt against the hijackers in an attempt to take back the plane. 9:59:00: The South Tower of the World Trade Center collapses, 56 minutes after the impact of Flight 175.
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You didn't put any answers, but I do know it is polite to greet the persons as they come on stage, and clap or cheer when they finish a song. It is also a good idea to put any electronic devices in sleep mode or simply turn them off.