Please help me ill give you the brainiest answer if you correct I'm desperate

Write the pair of fractions as a pair of fractions with a common denominator

In angle pqr find the measure of

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?