SOLUTION: Susan drove for 4 hours on secondary roads at a steady speed. She completed her trip by driving 2 hours on the interstate highway. Her total trip was 250 miles. Her speed on the i
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Question 836524: Susan drove for 4 hours on secondary roads at a steady speed. She completed her trip by driving 2 hours on the interstate highway. Her total trip was 250 miles. Her speed on the interstate portion of the trip was 20 miles per hour faster than her speed on the secondary roads. How fast did she travel on the secondary roads? Answer by josgarithmetic(39615) (Show Source):
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