Quote:
Originally Posted by dhurandhar
The right answer is 15 minutes. The implicit assumption being that the board is of a particular shape and will be cut in a certain way.
Take a piece of square board. Cut along lengthwise (or width wise, it does not matter in the first cut). The time it takes is 10 minutes (as stated).
Now, take one of the two pieces so generated, and cut it along its shortest dimension. Because the shortest dimension is one half the other dimension, the time taken is one half as well. Thus the time required is 5 minutes.
The total time is 10 + 5 = 15 minutes. The pieces generated are 3, one big and two small pieces.
Obviously, I think otherwise

You are just adding a lot of conditions and assumptions which were not present in the present problem. Offcourse since you have to always show your 'otherwise' thinking, it is excused and I would believe any answer you came up with. Even 12 minutes!