Question 1172769
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<pre>

Let x be the unknown length, in centimeters.


Then you have this "time" equation


    {{{x/16}}} - {{{x/18}}} = {{{25/60}}}  minutes.


To solve it, multiply both sides by 16*18*60.  You will get then


    18*60x - 16*60x = 25*16*18,   or

       x = {{{(25*16*18)/(18*60-16*60)}}} = now use your calculator = 60.


<U>ANSWER</U>.  The unknown length is 60 cm.
</pre>

Solved.


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Using &nbsp;"time" &nbsp;equation is a &nbsp;STANDARD &nbsp;method of solving such problems.

From this lesson, &nbsp;learn on how to write, &nbsp;how to use and how to solve a &nbsp;"time" &nbsp;equation.


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