Find angle measurement RTU !!

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

If 20% of a number is 35, what is 50% of that number?

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?