I'm so confused, our teacher assigned this but dident teach us how to do it

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

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?

Which of the following choices gives you a slope of 3?