.
= .
Solve this proportion for x to get the answer.
Notice that each side of this proportion is the speed (the rate), which is assumed to be constant in this problem.
On proportions see the lessons in this site:
- Proportions
- Using proportions to solve word problems
- Using proportions to estimate the number of fish in a lake
- HOW TO algebreze and solve this problem using proportions
- OVERVIEW of lessons on proportions
Read them and become an expert in this area.