Question 1118167
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I read the problem condition differently than the other tutor, and my solution is different.



<pre>
    Two planes fly toward each other.  Therefore, their relative speed is the sum 


        350 km/h + 450 km/h = 800 km/h.


    So, the second plane will intercept the first plane in  {{{200/800}}} hours =  {{{1/4}}} of an hour = 15 minutes.
</pre>