Lads here is one If a boat has a rope ladder attached to it with 12 rungs each rung 10" apart. At low tide 2 rungs are below the water. The tide rises at 5" per hour, how many rungs are covered after four hours?

Just a quick one more. Pick the main street in your town and try to figure out a route from one end to the other without passing a pub/bar and I will mail on the answer tomorrow.