SOLUTION: Sam took off on his motorcycle to Salt Lake City at the same time his Dad left for Salt Lake City in his semi. After 8 hours of driving, Sam was 120 miles ahead of his Dad. How fa
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Question 863075: Sam took off on his motorcycle to Salt Lake City at the same time his Dad left for Salt Lake City in his semi. After 8 hours of driving, Sam was 120 miles ahead of his Dad. How fast was Sam traveling if his Dad was driving 50 mph?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Sam's speed in mi/hr
Let = distance in miles Dad travels
-----------------
Sam's equation:
(1)
Dad's equation:
(2)
-----------------
(2)
and, by substitution:
(1)
(1)
(1)
--------------
Sam was traveling 65 mi/hr
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