How fast does the ISS have to travel to remain in a stable orbit a few hundred km above the Earth? (poll 3730464)

How fast does the ISS have to travel to remain in a stable orbit a few hundred km above the Earth?

About 1,600 km/hr, the same speed as the Earth's surface.

About 3,600 km/hr, the same speed the Moon travels around the Earth.

Around 5,400 km/hr, the speed of the fastest bullet on Earth.

Around 10,000 km/hr, because it's a big, round number.

Much more than any of these paltry choices.

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