Calculating Current given the number of electrons and positive ions

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Homework Statement

In a fluorescent tube of diameter 3 cm, 10 *10¹⁸ electrons and 2.5 * 10¹⁸ positive ions (with a charge of +e) flow through a cross-sectional area each second. What is the current in the tube?

Homework Equations

Current is I = (delta Q)/(deta T)

The Attempt at a Solution

delta t is given as 1 second, but how do u calculate the change in charge given this information?

 

[Delphi51]

Use the charge on the electron. Note that the positive ions will go the opposite way to the electrons, so you must add the two currents.