Since speed is a ratio between distance and the time it took to move that distance, the two required measures are Distanceand Time.
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A rectangle is a 2-dimensional shape. Therefore, it has no volume - which is what capacity measures.
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Its initial speed cannot be 20 m, as stated in the question. Secondly, if the initial speed is correctly given, then there is no need to calculate it!
Let S be the sum of the measures of all the interior angles, in degrees. Then the number of sides is S/180 + 2.
There are many different measures. One is the floor area where you add up the area of each floor.