Variable y varies directly with variable x, and y = 6 when x = 20. what is the constant of variation in decimal form?

Icould really use some with this question.

Are the corresponding angles congruent? explain why or why not.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?