0.15 is bigger, this is because the 0.05 in 0.15 has more value than 0.02 in 0.125, even though it has a third digit.
To find this out, use a percent proportion, use cross products, and solve the equation.

So, the percent tip is 14%.
The slope is 40 and the y-intercept is 30.
Umm... What exactly are you asking for? I'm a bit confused about this question.
Answer:
300 km in hour are the answers