Question 1150786
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Consider traveling in the same direction.


Their relative speed is  the difference  {{{abs(v[1] - v[2])}}}.


The condition "they pass each other" in this situation is


    {{{t*abs(v[1] - v[2])}}} = 160 m + 120m = 280 m,


where "t" is the given time of 75 seconds.


Hence, the difference of their speeds is  {{{280/75}}} meters per second, or  13.440 kilometers per hour.    <U>ANSWER</U>.
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Solved.


The rest of the condition is irrelevant, excessive and unnecessary.

It is not used in the solution.