Feet in a football field x inches in a foot / 7" banana
300x12=3600
3600/7=514.285
Edit: whoops! I was supposed to give the number of bananas in TWO football fields. I just noticed a bunch of other mistakes in the original comment as well. I’m not qualified to say things before I finish my morning coffee.
Where are you getting 40cm bananas?
The math assumes only 7" long bananas (17.78cm).
Feet in a football field x inches in a foot / 7" banana
300x12=3600
3600/7=514.285
Edit: whoops! I was supposed to give the number of bananas in TWO football fields. I just noticed a bunch of other mistakes in the original comment as well. I’m not qualified to say things before I finish my morning coffee.