Can I please have a brief explanation of this? the question and chart is in the image :) thanks! ​

Kathy spent 5/8 of her money on books and another 1/6 of her money on stationeries.what fraction of kathy’s money was left?

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9

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?