SOLUTION: After traveling 120 miles at the same speed for 4 hours Dixie increase their speed by 10 miles per hour how long does it take Dixie to travel the next 280 miles

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Question 1026217: After traveling 120 miles at the same speed for 4 hours Dixie increase their speed by 10 miles per hour how long does it take Dixie to travel the next 280 miles
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
For the 1st 120 mi, her speed was
+s%5B1%5D+=+120%2F4+
+s%5B1%5D+=+30+ mi/hr
------------------
+s%5B2%5D+=+30+%2B+10+
+s%5B2%5D+=+40+
+280+=+40t+
+t+=+7+
It takes her 7 hrs to travel the
last 280 mi