In a mountain region, from the border from the edge of a cliff, a man throws a rock that has 1kg of mass at an angle of 30 Degree above the horizontal top edge with an initial speed of 12 m/s. Someone observing from the bottom measures the trajectory time from top of cliff to bottom to be 5.6s. How far out from the edge of the cliff does the stone travel horizontally? (g = 9.81 m/s2 and air resistance is negligible)

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