In a certain​ skyscraper, the elevators whisk you to a restaurant in the skyscraper at a speed of 500 feet in 40 seconds. If the restaurant is 300 feet​ up, how long will it take you to reach the restaurant by​ elevator?

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit