Question 1091720
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<pre>
The time = {{{300/(30+60)}}} = {{{300/90}}} = {{{3}}}{{{1/3}}} hours = 3 hours and 20 minutes.


Since thy move toward each other, the relative speed is 30 = 60 = 90 km/h.
It means that the distance between them 
decreasing at the rate of 90 miles per hour.


From the over side, yo know the formula  time = {{{distance/rate}}}.


In this way you get the final formula and the final result.
</pre>

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On solving Travel and distance problems for two bodies moving toaward each other see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/word/travel/Travel-and-Distance-problems.lesson>Travel and Distance problems</A>  

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/word/travel/Travel-and-Distance-problems-for-two-bodies-moving-toward-each-other.lesson>Travel and Distance problems for two bodies moving in opposite directions</A> 

in this site.