<PRE><B>Question 1005989</B>
Same problem, different numbers.
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A car travels 380 miles averaging a certain speed. If the car had gone 5 mph faster the trip would have take 1 hour less. What was the average speed?
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d = r*t
t = d/r
t = 380/r
t-1 = 380/(r+5)
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380/r - 1 = 380/(r+5)
(380 - r)/r = 380/(r+5)
(380 - r)*(r+5) = 380r
(r-380)*(r+5) = -380r
r^2 + 5r - 1900 = 0</PRE>