A plane capable of flying at 500 miles per hour makes a 3000 mile trip. Because of headwind, the return flight takes 1.5 hours longer than the original flight, which had the advantage of a tailwind. Find the speed of the wind.

Awoman has 14 different shirts: 10 white shirts and 4 red shirts. if she randomly chooses 2 shirts to take with her on vacation, then what is the probability that she will choose two white shirts? show your answer in fraction and percent, round to the nearest whole percent.