Question 990879
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<B>Answer</B>. &nbsp;t = {{{140/(20+15)}}} = {{{140/35}}} = 4 hours.


<B>Solution</B>


Let &nbsp;<B>t</B>&nbsp; be the time they travel before to meet each the other.


Then the car will cover &nbsp;20*t &nbsp;kilometers, &nbsp;and the bicycle will cover &nbsp;15*t &nbsp;kilometers. 


The sum of these distances is exactly &nbsp;140 km.


So, you have an equation


20*t + 15*t = 140.


Solve it:


(20 + 15)*t = 140,


35*t = 140,


t = {{{14/35)}}} = 4 hours.



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