I need more ropes

I want to take the water from the well with a bucket attach to rope. The problem is, I don’t know the deep of the well, so I decided to drop a marble from the top of the well and 3517\frac{35}{17} second later the sound of the marble I dropped touched the water on the well heard. If g=10 m/s2 g = 10 \text{ m/s}^2 and the speed of sound is 340 m/s340 \text{ m/s}, calculate the minimum length of the rope that I need to get the water from the well.

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