Two stationary positive point charges, charge 1 of magnitude 3

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Two stationary positive point charges, charge 1 of magnitude 3.90 nC and charge 2 of magnitude 1.80 nC, are separated by a distance of 46.0 cm. An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

I have no clue what do to...I am at a complete loss!

Please show the steps with explanation and equations needed...not just the answer so that I can understand please!

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