If 20 men can build a wall 25 meters long in 4 days, what length of a similar wall can be built by 30 men in 6 days?

If 20 men can build a wall 25 meters long in 4 days, what length of a similar wall can be built by 30 men in 6 days?
1). 11.11 m
2). 50 m
3). 56.25 m
4). 62.6 m

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