At what separation should two equal charges 1.0 C be placed so that the force between then equals the weight of a 25 kg person ?

Question

$(a)\;6\times10^4\;m\qquad(b)\;3\times10^4\;m\qquad(c)\;6\times10^3\;m\qquad(d)\;2\times10^4\;m$