Divide row by row

Hi, so I still have one problem.

I apologize if I'm not being able to explain myself well enought.

My table uses slices of five minutes. When I need a one hour slice, I need it to sum everything in that one hour slice for the Banana and Apple column and then divide them.

Example, let's use 10 minutes slices.

This is my original table

Time           Banana   Apple

1300-1305    1000       50

1305-1310    2000       30

1310-1315    3000       10

1315-1320    2500       20

I need something like this

Time           Banana  Apple

1300-1310    3000      80

1310-1320    5500      30

And then I'll do the math you suggested.

Any way to do this?

Cheers.