SOLUTION: 2 cars start 15 miles apart they travel in a straight line towards each other. If they are going at 20 and 55 miles per hour respectively, how long does it take for them to meet up

Algebra ->  Customizable Word Problem Solvers  -> Age -> SOLUTION: 2 cars start 15 miles apart they travel in a straight line towards each other. If they are going at 20 and 55 miles per hour respectively, how long does it take for them to meet up      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 885615: 2 cars start 15 miles apart they travel in a straight line towards each other. If they are going at 20 and 55 miles per hour respectively, how long does it take for them to meet up?
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 traveling at the sum
of their speeds
-----------------
Let +t+ = the time in hrs
+15+=+%28+20+%2B+55+%29+%2A+t+
+15+=+75t+
+t+=+15%2F75+
+t+=+1%2F5+ hrs
+t+=+%28+1%2F5+%29%2A60+ min
+t+=+12+ min
It takes 12 minutes for them to meet