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a) What is the max height reached by the rocket? Answer: delta x = 308.16 m

b) When does the rocket reach max height? Answer: t-up = 8.52 s

c) How long is the rocket in the air? Answer: t = 16.45 s

I can't figure out this problem at all. I know that I have to use the equation X = X_o t + 1/2at^2. The problem is, I don't know what t is and it's what's being asked in b and c. The equations V = V_o + at doesn't work either because I'm missing t. The equation V^2 = V_o^2 + 2a (delta)X doesn't work either because I'm missing the X which is asked for in A. Please help.