The tower clock strikes three times in 12 s. How long will it take to strike six times?

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What is the interval between two consecutive strikes

## Solution

Since 3 strikes of the clock take 12 seconds, the interval between two consecutive strikes is 6 seconds. From the first strike to the second is 6 seconds, and from the second to the third is also 6 seconds. Six strikes, however, occur with 5 intervals. Therefore, 6 strikes will take $5 \times 6 = 30$ seconds.

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