Help! Math Is Hard!

Question

Lauren and Liam are driving cars. Lauren drives at 25mph and Liam at 20mph. They start and end at the same place. Lauren arrives 1 hour earlier. How far did they go?

Answer 1

Understand that they both traveled the SAME distance.  So you are looking for friendly numbers that both 25 and 20 can go into, or in other word, the least common denominator.

 

You should see that they both went 100 mi.  It took Lauren 4 hours (100/25), and Liam 5 hours (100/5).