Zero g planet

Classical Mechanics

If there were a planet with the mass $6\times 10^{24}\text{kg}$ and angular velocity $7 \ times10 ^{5} \文本{rad / s}$ of Earth, what would be the radius required in order for the free-fall acceleration on its surface to be $0 \text{ m/s}^2?$

4.4\times10^{4} \text{m}

4.4\times10^{7} \text{m}

4.4\times10^{10} \text{m}

4.4\times10^{13} \text{m}