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This is a summary of the info she has

g=9.8m/s2

Point A to B is 12km

uniform acceleration 3/4 of Total distance

deceleration 1/4 of Total distance

Total Time 20mins

Whats the max velocity of the train?

I would apreciate if some could help me to solve this and teach me how to do it, Ill look like a genius to my daughter.

Kind Regards

Kai