A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.60 later.

What is the rocket's acceleration?

I'm wanting to use the 3 kinematics equations but I feel like i'm missing information. I know what the answer is already but I want to understand how to get it. It seems I can't simply use the equations for 1D kinematics so if anyone can show me i'd be much obliged.