SOLUTION: Sandra left New York and drove at a speed of 20 kph. Cecille left 3 hours later, from the same point, and drove at a speed of 30 kph. How long it will take Cecille to catch up Sand

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Sandra left New York and drove at a speed of 20 kph. Cecille left 3 hours later, from the same point, and drove at a speed of 30 kph. How long it will take Cecille to catch up Sand      Log On

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Question 503705: Sandra left New York and drove at a speed of 20 kph. Cecille left 3 hours later, from the same point, and drove at a speed of 30 kph. How long it will take Cecille to catch up Sandra?

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
What is Sandra's head start in km?
+d%5B1%5D+=+20%2A3+
+d%5B1%5D+=+60+ km
Start a stop watch when Cecille leaves
Cecille's equation:
+d+=+30t+
Sandra's equation:
+d+-+60+=+20t+
+d+=+20t+%2B+60+
Since d is the same for each,
+30t+=+20t+%2B+60+
+10t+=+60+
+t+=+6+
It will take 6 hours for Cecille to catch up Sandra