Question 1146083
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<pre>

To answer your question, solve the equation  s(t) = 160  

(I mean that the surface is the top of the 160-feet building --  it is how I interpret the term "return").


This equation is


    {{{-16t^2 + 64t + 160}}} = 160,


or simplified


    {{{-16t^2 + 64t}}} = 0.


The root you want is  t = {{{64/16}}} = 4 seconds.    <U>ANSWER</U>
</pre>


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These words "close to the edge" were introduced into the problem formulation with the only goal to confuse the reader.


It is &nbsp;"pure US american" &nbsp;style formulating Math problems (to load them with excessive and unnecessary words).


In normal mathematical formulation, a professional and knowledgeable author never uses such tricks.


My advise to the author is to remove these words from the text.