SOLUTION: Two cars start at the same time, but travel in opposite directions. One car's average speed is 70 miles per hour (mph). At the end of 5 hours, the two cars are 600 miles apart. Fin

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Question 1095725: Two cars start at the same time, but travel in opposite directions. One car's average speed is 70 miles per hour (mph). At the end of 5 hours, the two cars are 600 miles apart. Find the average speed in mph of the other car.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +s+ = the speed of the other car
Think of this as one of the cars standing
still and the other moving at the sum
of their speeds
--------------------------------------
+600+=+%28+70+%2B+s+%29%2A5+
+600+=+350+%2B+5s+
+5s+=+250+
+s+=+50+
The average speed of the other car is 50 mi/hr
--------------------
check:
+d%5B1%5D+=+70%2A5+
+d%5B1%5D+=+350+
and
+d%5B2%5D+=+50%2A5+
+d%5B2%5D+=+250+
and
+d%5B1%5D+%2B+d%5B2%5D+=+350+%2B+250+
+d%5B1%5D+%2B+d%5B2%5D+=+600+
OK