Answer:
You cannot list every single multiple of 15, but some of them are 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, and 195.
Step-by-step explanation:
keeping in mind that a line with a slope of "0" is a horizontal line, Check the picture below.
(-7,14,21,42)
(-7,-4,2,14,21,34,42)
-7 = 7*-1 yes
14 = 7*2 yes
21 = 7 *3 yes
42 = 7*6 yes
40 minutes (I think)
Calculate the time into minutes
15mph-0.25mpm
18mph-0.3mpm
add them together to find out how far they go combined each minute
0.55
divide 22 by 0.55 to find the total time
40 minutes