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UPSC Prelims

Mathematics

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Clocks and Calendars / घड़ी और कैलेंडर

Q43 2017, Clocks and Calendars

A clock strikes once at 1 o'clock, twice at 2 o'clock and thrice at 3 o'clock, and so on. If it takes 12 seconds to strike at 5 o'clock, what is the time taken by it to strike at 10 o'clock?

एक घड़ी 1 बजे एक बार बजती है, 2 बजे दो बार और 3 बजे तीन बार बजती है तथा इसी प्रकार आगे इसका बजना जारी रहता है। यदि 5 बजे इसको बजने में 12 सेकंड लगते हैं, तो 10 बजे इसे बजने में कितना समय लगेगा?

Explanation Please wait..

At 5 o’clock the clock will strike 5 times. It’s given that it takes 12 seconds to do so.

Now, at 10 o’clock the clock will strike 10 times. Hence, the time taken by it to strike = 12 × 2 = 24 seconds

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