To ensure that he is not late for exam Ram 39 s teacher asked him to set the alarm for Monday 11 am ...........

Logical Reasoning(Master ) Clock

To ensure that he is not late for exam, Ram's teacher asked him to set the alarm for Monday 11 am. He sets it correctly at 1 am on Sunday but wasn't aware about the fault in the clock. The clock gained 20 minutes for every 24 hours. What would be the actual time when the alarm would go off?

28 minutes 20 seconds before 10 am

31 minutes 40 seconds past 10 am

28 minutes 20 seconds past 11 am

31 minutes 40 seconds past 11 am

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Explanation:

From 1.00 am Sunday to 11 am Monday we have
24 hours (till 1 am Mon) + 10 hours = 34 hours
20 minutes gained in 24 hours
∴ ? minutes gained in 34 hours
∴ ? = 28.333 minutes = 28 minutes 20 seconds
Alarm will go off at 11 am
But actual time will be less than that because clock had gained time.
∴ Actual time = 11am - 28 minutes 20 seconds = 31 minutes 40 seconds past 10 am.

Hence, option 2 is the correct answer.