Two point masses are apart in air

PHYSICS · Subjective · CBSE · Physics · Gravitation · Gravitation

Problem

Two point masses are

0.30\,\text{m}

apart in air. If the gravitational force between them is

3.2\times10^{-9}\,\text{N}

and one of the masses is

0.40\,\text{kg}

, find the other mass correct to two significant figures.