When we face a tricky problem, we often try to attack it with our logical thinking. This will often lead us right, but sometimes it may be worth taking a step back to consider the problem from another point of view.
Problem 1: Precisely at sunrise, a monk begins to climb a high mountain on a small path to reach a temple located on the top. The walk is laborious and he has to stop and rest several times. He arrives to the mountain top late in the afternoon and spends the night in the temple.