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F = M × m × 1÷d^2 × G
d^2 = M × m × G × 1÷F
= (40 × 60 × 6 × 10^-11 × 1÷4 × 10^5) m sq.
= (36 × 10^-11 × 10^7) m sq.
= ( 36 × 10^-4 × 10^4 ) cm sq.
= 36 cm sq.
d = root ( 36 cm sq. )
= 6 cm ans.