Question 1154679
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The first car travels for 1.5 hours at 65mph before the second car starts.  In that time it travels 65*1.5 = 97.5 miles.<br>
The second car has to make up those 97.5 miles in 5 hours; the rate at which it must catch up to the first car is 97.5/5 = 19.5 miles per hour.<br>
So the speed of the second car must be 19.5mph faster than the speed of the first car: 65+19.5 = 84.5mph.<br>