The Hubble Space Telescope (HST) orbits Earth at an altitude of 613 km. It has an objective

Question:

The Hubble Space Telescope (HST) orbits Earth at an altitude of 613 km. It has an objective mirror that is 2.4 m in diameter. If the HST were to look down on Earth's surface (rather than up at the stars), what is the minimum separation of two objects on the Earth's surface that could be resolved using 550-nm light?