We have been given that Nina earns $60 for 5 hours of shoveling snow.
1. Let us find how much Nina earns per hour of shoveling snow.


Let us find amount Nina will earn for 6.5 hours of shoveling snow by multiplying 12 by 6.5 .

Therefore, Nina will earn $78 for 6.5 hours of shoveling snow.
2. We can find number of hours Nina need to shovel to earn $36 by dividing total amount Nina needs to earn ($36) by amount Nina gets for one hour of snow shoveling ($12).

Upon dividing 36 by 12 we will get,

Therefore, Nina will need to shovel snow for 3 hours to earn $36.