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Two alpha particles (charge+2e and mass 6.6x10^-27 kg each) are released from rest, separated by 3.4x10^-12m....

Two alpha particles (charge+2e and mass 6.6x10^-27 kg each) are released from rest, separated by 3.4x10^-12m. When the speed of each particle is 1.7x10^5m/s, how far apart are they?
+ answer should be 1.2x10^-11 but i dont know how to get this value:(
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