Question $4(1$ point$)$

NASA is studying a pair of binary asteroids in the solar system. One has a mass of $5\mathrm{.}8{10}^{16}kg$ and the other a mass of $1\mathrm{.}2{10}^{17}kg.$ They have an average separation of $4000$ km $.$ Where could we place the probe, distance from the smaller asteroid, so that it has no net force? $($answer in km$)$

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