SOLUTION: Two cars leave from the same location and travel in opposite directions along a straight road. One car travels 30 miles per hour while the other travels at 45miles per hour. How lo

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Question 487963: Two cars leave from the same location and travel in opposite directions along a straight road. One car travels 30 miles per hour while the other travels at 45miles per hour. How long will it take the two cars to be 255 miles apart?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Think of this as one car standing still and
the other one moving at the sum of their
speeds.
+255+=+%28+30+%2B+45+%29%2At+
+t+=+255%2F75+
+t+=+3.4+ hrs
+.4+ hrs = +.4%2A60+=+24+ min
+t+ = 3 hrs and 24 min