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There is no such unit of measurement as a diameter, a diameter is the length across something. Perhaps you are thinking of a decimetre.
The average speed is exactly 30 meters per 6 seconds. Expressed in some other units . . . -- 300 meters/minute -- 18 kilometers/hour -- 5 meters/second -- 0.005 millimeters/microsecond
It can be. But it can also be a preposition (e.g. across the valley).
The square root of 900 is ±30 because 30 * 30 = 900 and -30 x -30 = 900
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