234 millimeters^2 is your answer
No info was given, plz post a pic of the equation
well, let's split the hours in minutes, so since 1 hr is 60 minutes, so he can walk 2.833 miles in 60 minutes, well, 3 hrs is 3*60 = 180 minutes, then we add 15 minutes, that's 195 minutes.
if he can walk 2.833 miles in 60 minutes, how long will it be for 195 minutes?

Answer:
I think its B.
Step-by-step explanation:
sorry if i am wrong.