B.) 3.250*106 days
I figured it out!! Yay!
You take 7.8 and divide it by 24 which will get you 0.325
In order to get it match one of the options, multiply it by 10 (which will add 1 to 105!) Leaving you 3.25*106
3.007 ounces per square meter
I believe that once Antoine has been walking for 75 minutes his brother will habe caught up, and this would mean his brother had walked for 44 minutes