Multiple choice

Two clocks are set correctly at 10 am on Friday. The first clock gains 2 minutes per hour and it gains twice as much as the second clock. What time will the second clock show when the correct time is 2 pm on the following Monday?

  1. 2:42 pm

  2. 3:16 pm

  3. 3:32 pm

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

First clock gains 2 min/hr. Second clock gains 1 min/hr. Time elapsed from Friday 10 am to Monday 2 pm is 72 + 4 = 76 hours. Second clock gains 76 minutes. 2 pm + 76 minutes = 3:16 pm.

AI explanation

From 10 am on Friday to 2 pm on the following Monday, there are exactly 76 hours. The first clock gains 2 minutes per hour, so its total gain is 152 minutes. The first clock gains twice as much as the second clock, meaning the second clock gains 1 minute per hour, for a total gain of 76 minutes. Adding 76 minutes to the correct time of 2 pm gives 3:16 pm.

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