Brett took elevator a from the 6th floor to the lobby, the 0 floor. his nonstop tip took 9 seconds.
bragg took elevator b from the 3rd floor to the pool on the 11th floor. bragg nonstop trip took 16 seconds.
sarah took elevator c from the 1st floor to the 10th floor. her nonstop trip took 12 seconds.
which elevator is the fastest?
settle this with tables, graphs, and equations.

Brett traveled (0 - 6) = 6 floors down, in 9 seconds. 

                                       6/9 = 2/3 sec per floor.

Bragg traveled (11 - 3) = 8 floors up, in 16 seconds. 

                                        8/16 = 1/2 sec per floor.

Sarah traveled (10 - 1) = 9 floors up, in 12 seconds. 

                                       9/12 = 3/4 sec per floor.

Bragg's trip was the fastest.
Sarah's was the slowest.

When two lines intersect, they form two pairs of equal angles, which, taking one of each, add up to 180°. (jargon: angles forming a straight line   show more