Solution
For this case we have the following info given:
Distance Time (minutes)
5 40
7 52
9 64
Then we want to find the time to travel 1 km so we can set up the following equation:
y= mx + b
m = represent the time to ride 1km
b= represent the fixed value
40 = 5m +b
52 = 7m +b
64 = 9m +b
52-40 = 7m-5m +b-b
12 =
________________
For example if m = 6 then b = 10
b=40 -5*6 = 10
Then we can conclude that for this case the answer is:
6 minutes