Eliminating 't' from the given equations, we get the equation of the path as given point
Obviously, the path of the point is a straight line passing through origin (0, 0, 0)
When t = 10 hours the position of point is at x = 20, y = - 40, z = 40.
i.e., After 10 hours the position of point will be at (20, - 40, 40)
Therefore, required distance = distance between point (0, 0, 0) and (20, - 40, 40)