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There are five ways to learn math well.
The least common multiple of 50 and 60 is 300.

So one in 300 meters doesn't have to move.

The total length is 50 * (55- 1) = 2700.

One for every 300, so 2700/300 = 9.

Because one of the two ends does not need to move, there is 9- 1 = 8 in the middle that does not need to move.