Physics Problem: High School level dealing with acceleration

A light plane must reach a speed of 30 m/s for takeoff. How long must the runway be if the (constant) acceleration is 3.0 m/s^2?

What formula/s will help me solve the problem?

(v^2/2a) = 150 metres.

If its velocity increases 3m/s every second. You can intuitively know you will reach 30 m/s in 10 seconds man.