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An old-fashioned clock takes 30 seconds to strike six o'clock.

How long will it take to strike twelve o'clock, in seconds?

Assumption: Each strike is instantaneous, and the interval between strikes is constant.

 May 9, 2020
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To strike six o'clock, there are 5 intervals.

So, under the assumption that each strike is instantaneous, it will take 30 seconds / 5 intervals, or 6 seconds per interval.

 

To strike twelve o'clock, there are 11 intervals.

A 6 seconds per interval, this will take 11 x 6 = 66 seconds.

 May 9, 2020

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