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Within how many minutes after immersion in cold water does 'swimming failure' typically occur due to loss of hand strength and sensation?

  1. Immediately

  2. Between 3 and 30 minutes

  3. After 1 hour

  4. It does not happen

The correct answer is: Between 3 and 30 minutes

B Between 3 and 30 minutes. This is the most accurate option because while swimming failure can potentially occur immediately after immersion in cold water, it is more common for it to occur between 3 and 30 minutes due to the gradual loss of hand strength and sensation. Option A is incorrect because while swimming failure can happen immediately, it is less likely. Option C is incorrect because an hour is a longer period of time than what is typically observed for swimming failure to occur. Option D is incorrect because swimming failure can occur, especially in colder temperatures.