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First overtone of an open pipe equals the fundamental of a closed pipe: find the other pipe's length

The same question, asked 2 times: 25 Jun 2022*, 31 Jan 2024. Every wording below, oldest first.

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  1. Question 1

    25 Jun 2022

    25
    The first overtone frequency of an open organ pipe is equal to the fundamental frequency of a closed organ pipe. If the length of the closed organ pipe is 20 cm20\text{ }cm. The length of the open organ pipe is ____\_\_\_\_ cmcm.

  2. Question 2

    31 Jan 2024

    15
    The fundamental frequency of a closed organ pipe is equal to the first overtone frequency of an open organ pipe. If length of the open pipe is 60 cm60\text{ }cm, the length of the closed pipe will be:

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