Question 774719
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The difference in their speeds is 65 minus 40, so the faster car is opening the distance between the two cars at a rate of 25 miles per hour.  Distance equals rate times time, so time is distance divided by rate.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ t\ =\ \frac{90}{25}\ \text{hours}]


Just do the arithmetic.  If you need the time expressed in hours and minutes, just remember that one-tenth of an hour is 6 minutes.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
<font face="Math1" size="+2">Egw to Beta kai to Sigma</font>
My calculator said it, I believe it, that settles it
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