Answer is in a photo. I couldn't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

3:13 - 1:00 = 2:13
2:13 - 0:37 = 1:36
1:36 is your answer.
Glad I could help, and good luck!
AnonymousGiantsFan
Answer:
0.3056 or 30.56%
Step-by-step explanation:
The volume of the grapefruit with the peel is:

When removing the peel, the grapefruit diameter becomes 10 cm (take out 1 cm of peel from each side). The volume of the grapefruit without the peel is:

The percentage of the volume correspondent to the peel is given by the difference between both volumes, divided by the total volume:
30.56% of volume of the grapefruit is the peel.
It’s 1 that’s in the ten billions