At the end of the school year, Rachel and Amber threw their Algebra textbooks off the top of a 12-story building. The equation of the pathway of each book is given below. By how many seconds does Rachel's textbook beat Amber's textbook to the ground? *

(HCF)=(36,60,84)Factors of 36 List of positive integer factors of 36 that divides 36 without a remainder. 1,2,3,4,6,9,12,18,36Factors of 60 List of positive integer factors of 60 that divides 60 without a remainder. 1,2,3,4,5,6,10,12,15,20,30,60Factors of 84 List of positive integer factors of 84 that divides 84 without a remainder. 1,2,3,4,6,7,12,14,21,28,42,84We found the factors 36,60,84 . The biggest common factor number is the HCF number. So the highest common factor 36,60,84 is 12.HOPE IT HELPS