Joe is trying to run away from the police. He runs at an average of 5 miles per hour. But sadly, the police cars go at 15 miles an hour. The sewer, which will lead him to freedom, is 20 miles away.
How far is Joe from the police, assuming that when he reaches the sewer, they will have just caught up with him?
Hint
Think of the sewer as point 0 on a number line.
Answer
He is 40 miles away. Assuming that the sewer is 0, when he is 5 miles away, the police are 15 miles. Keep doing this until he gets to the distance he is from the sewer now, which is 20 miles away. You should see that the police are 60 miles away from the sewer.
