Answer: 11.8 km
Step-by-step explanation:
The resulting figure is a right angled triangle shown below

Time is your independent variable, and snowfall is your dependent variable.
Slope can be found by calculating ∆y/∆x:

Snowfall will accumulate 0.02 m every hour.
The probability of randomly selecting a red marble is 1/5. You get that by dividing 1/15 by 1/3