Mathematics, 28.07.2019 15:30 Halessoftball

Nasa uses a launch clock to measure time before and after lift-off. it takes 2 hours and 15 minutes of preparations on base, 20 minutes to travel to the launch pad, and 40 minutes of pre-launch checks once in the spacecraft. when should the astronauts begin preparation?

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Nasa uses a launch clock to measure time before and after lift-off. it takes 2 hours and 15 minutes...