Answer:
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Step-by-step explanation:
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I think this is how you're supposed to do it
20,000/120 = 166.66666666666667 m/s

we needed to eliminate w, do so by diving both sides by w and obtain the above result :)
Hope this helps.
The main formula of a suface area of a cube is as follow:
A = 6x a², where a is the edge length
if a= 1.5, so A= 1.5² x 6= 13.5
so the answer is A= <span>13.5</span>