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Count:

40 days before the flood receded. The world is 40000km round at the equator. The flood was higher than Mount Ararat (3.2 miles high). So a wall of water, 3 miles high, travelled round the world at 25 miles per hour?

Actually, the flood was around for more like 150 days, if you count up the time hanging around described by Jenny Sis. So we have something more like a 7mph tsunami. Which gives Noah's ark a little more credibility in terms of surviving the wave front, but rather increases the logistical problems of feeding half a million species of animals, without wondering what happened to the plants.