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I don't know how to do this. I know you plus the x^2 into the 2x+3y=4 equation, but i can't do this. can someone help me?

A train travels between stations 1 and 2. The engineer of the train is instructed to start from rest at station 1 and accelerate uniformly between points A and B, then coast with a uniform velocity between points B and C, and finally accelerate uniformly between C and D until the train stops at...