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### Question Asked by a Student from EXXAMM.com Team

** Q 2115478369. ** The equation of motion of a point in space is `x = 2t,

y =- 4t, z = 4t`, where it measured in hour and the

coordinates of moving point in kilometers. The distance of

the point from the starting point `O(0, 0, 0)` in `10` hours is