Two trains left a station at the same time. one traveled north at a certain speed and the other traveled south at twice that speed. after 4 hours, the trains were 600 miles apart. how fast was each train traveling? write an equation to solve.

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups