What is 3*8-3*5?
Not quite sure how to subtract times using an hourglass. Can't drain the 8' one and then subtract the 5' one.
However, if we do the following, I think it works. There may be more elegant ways:
The three columns show the running time, and the operations of turning glasses, with their remaining sand
time 8' 5'
0 8 5
5 3 0
8 0 2
10 6 0
15 1 0
Now you can start cooking, with 1' of sand in the 8' glass.
After 1 minute, turn the 8' glass and let it drain.
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