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"The maximum speed limit on the freeway is 70mph."
A projectile has minimum speed at the top of the trajectory.
Time = distance/speed = 324/70 hours = 4.63 hours (approx).
The projectile have minimum speed when it is in top of prabolic and it have max sped when it is in intial point
http://www.wolframalpha.com/input/?i=200+miles+at+70mph