The last Harry Potter novel has just arrived and by 11 am a line has formed outside the crowded bookstore. Knowing you have class at noon, you ask the guard at the door how long you can expect to wait. She tells you that she is permitted to let 6 people into the store only after 6 people have left; customers are leaving at the rate of 2 customers per minute; and she has just let 6 new customers in. Also each customer spends an average of 15 minutes browsing at books and 10 minutes waiting in line to check out. How many minutes are there between groups of customers entering the book store?

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

1. a driveway has a 15° grade. if the driveway is 40 meters long, how much does the driveway rise? (nearest tenth of a meter) 2. a person located 4 miles from a rocket launch site sees a rocket at an angle of elevation of 32°. at that moment, how high is the rocket above the ground? (nearest tenth of a mile) 3.an airplane approaches an airport landing strip with an angle of depression of 12°. if the airplane is flying at an altitude of 20,000 feet, find the distance on the ground that the plane will need to land. (nearest 1,000 feet) 4.two buildings are located on opposite sides of the street, 40 meters apart. the angle of elevation from the top of the shorter building to the top of the taller building is 53°. if the taller building is 300 meters tall, what is the height of the shorter building? (nearest meter) 5.george is 187 cm tall. his son, ralph, is 142 cm tall. who casts the longer shadow. george when the sun is 65° above the horizon, or ralph when the sun is 56° above the horizon? how much longer? (nearest centimeter)

What is the interquartile range of this day at set?