Two bodies of mass m and M are placed a distance d apart. The gravitational potential at the position where the gravitational field due to them is zero is V. Then :

dist from m where field is zero is x  which satisfy the condition Gmx2=GMd-x2   solving for x we get x=dmm+M  and (d-x) is dMm+M then potential there V=-Gmx-GMd-xsubstituting the values we get V