i know the answer but would like to see other people's. if it takes a man and a half, a day and a half, to dig a hole and a half, how long does it take for half a man to dig half a hole?
If the first hole is of a specific dimension, then half a hole is a valid concept. When digging for foundations of a house for example, if the required excavation is 20 square metres and 2 metres deep, then a hole 10x20x2 would be half way.