SOLUTION: Natalie and Adam left the airport at the same time. They drove in opposite directions. Adam drove 60 mph faster than Natalie. After one hour they were 100 miles apart. Find Natalie

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Question 832421: Natalie and Adam left the airport at the same time. They drove in opposite directions. Adam drove 60 mph faster than Natalie. After one hour they were 100 miles apart. Find Natalie's speed.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
You can think of Natalie as standing still
and Adam driving away from her at
the sum of their speeds
Let +s+ = Natalie's speed in mi/hr
+100+=+%28+s+%2B+s+%2B+60+%29%2A1+
+100+=+2s+%2B+60+
+2s+=+40+
+s+=+20+
+s+%2B+60+=+80+
Natalie's speed is 20 mi/hr
-----------------------
check:
For Natalie:
+d%5B1%5D+=+20%2A1+
+d%5B1%5D+=+20+ mi
For Adam:
+d%5B2%5D+=+80%2A1+
+d%5B2%5D+=+80+ mi
+d%5B1%5D+%2B+d%5B2%5D+=+20+%2B+80+
+100+=+100+
OK