JEE Main 2019 — Gravitation Question with Solution

A spaceship orbits around a planet at a height of $20\mathrm{ }\mathrm{k}\mathrm{m}$ from its surface. Assuming that only gravitational field of the planet acts on the spaceship, what will be the number of complete revolutions made by the spaceship in $24$ hours around the planet?
[Given: Mass of planet $=8\times {10}^{22}\mathrm{ }\mathrm{k}\mathrm{g}$ ,
Radius of planet $=2\times {10}^6\mathrm{ }\mathrm{m},$
Gravitational constant $\mathrm{G}=6.67\times {10}^{-11}\mathrm{ }\mathrm{N}{\mathrm{m}}^2/\mathrm{k}{\mathrm{g}}^2$ ]