Okay so Madara starts off around 50 m away from the Gokage (
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)
Then Tsunade
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sending him flying another 20 m (
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). Tsunade is only 4 m away from the katon when Mei manages to extinguish it and get 20 m behind susanoo despite being 70 m in front of his susanoo.
All in all, in a short span of time, Mei manages to cover a distance greater than what Tsunade covered and is still able to execute two high level suiton techniques back to back within a small time frame. Quite impressive.