Niles and bob sailed at the same time for the same length of time. niles' sailboat traveled 45 miles at a speed of 9 mph, while bob's motorboat traveled 70 miles at a speed of 14 mph. for how long were niles and bob traveling?

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