A clocks takes six seconds to strike four; how long it will take to strike ten?

15 sec

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16 sec

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20 sec

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18 sec

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Solution

The correct option is D 18 sec
When the clock strikes four, there are three intervals between. So three interval take 6 seconds and each interval takes 2 seconds. Now when it strikes 10, there are 9 intervals and it takes 18 sec.

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