There is a tyre lying on a completely level ground. The tyre is not attached to a wheel. It is raining at two inches per minute. If it will take three days of rain to make the water level with the tyre, how long will it take for the water to engulf the tyre, assuming the tyre is five inches tall?

Answer
It would never happen. The tyre is made from vulcanized rubber, which floats. It could rain for years and the tyre would still be floating.