A biker cycles 9 miles in 2/3 of an hour. The distance here varies with time. What is the constant of variation ? (It is the hikers rate .)

I'm terrible at math any here is appreciated.

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin