Q 2165478365.     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

A

`20`km

B

`40`km

C

`60`km

D

`55`km

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