A small excursion boat with a flat deck bobs up and down excuting simple harmonic motion due to the waves on a lake. The amplitude of the motion is 0.300 m and the period is 2.90 s. A stable dock is next to the boat at a level equal to the highest level of the deck. People wish to step off the boat onto the dock but can do so comfortably only if the level of the dock is within 0.100 m of the dock level. How much time do the people have to get off comfortably during each period of the simple harmonic motion?