Question 1199673
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The setup shown by the other tutor is a good one, which many students will find easy to use.<br>
An alternative setup, which I personally prefer, is to say that since the times are the same the ratio of speeds and the ratio of distances are the same.  So<br>
{{{(x+30)/(x-30)=480/240}}}<br>
Both setups lead immediately to the same equation to be solved, so students can use whichever one "works" best for them.<br>