Finding time it takes for electron to travel a certain distance

1. The problem statement, all variables and given/known data
Over a distance of 3 cm an electron accelerates uniformly from a speed of 9 x 103 m/s to a speed of 6 x 106 m/s. How long does it take the electron to cross this distance?

2. Relevant equations

d = 1/2(v0 + v)t

3. The attempt at a solution

Find t:

d = 3 cm /10 cm = 0.3 m
2 d / v0 + v = t

2 (0.3 m) / (9 x 103 m/s + 6 x 106 m/s) = t

This is where I got a little lost, especially with trying to do it on paper as I’m not able to use a calculator for the test.

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