1. They faced the three men suffocating in the capsule which caused them to make the modules better, in certain places in space they lost radio connection with the astronauts and that they had to hurry if they wanted to get to the moon before the Russians.
2. A command module is attached to the top of the rocket and it's what they used to bring them home. A lunar module is what they used to land on the surface of the moon and also the lunar module is attached to the command module.
3. It took them 20 hours to orbit he moon.