If I remember correctly I think its B. 15 mm
ANSWER
6.5 calories per minute.
EXPLANATION
To find the calories Shelley burned per minute, divide the total calories burned by the total minutes ran.
Calories burned for a minute

This will give us,

The original answer should be 48/100.
Reduced is 24/50
Even more is 12/25
Your answer is 12/25
B. 2 2/9 hours.
in 2 hours the will already have made 96 cupcakes so the only logical answer is B