Multiple choice

David sets his watch at 6 : 10 am on Sunday, which gains 12 minutes in a day. On Wednesday if this watch is showing 2 : 50 pm. What is the correct time?

  1. 1 : 50 pm

  2. 2 : 10 pm

  3. 2 : 30 pm

  4. 3 : 30 pm
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B Correct answer
Explanation

From Sunday 6:10 am to Wednesday 2:50 pm is 3 days and 8 hours and 40 minutes (80 hours and 40 minutes). The watch gains 12 minutes in 24 hours (1440 minutes), so it gains 1 minute every 120 minutes. In 4840 minutes, it gains 4840 / 120 = 40.33 minutes. Subtracting the gain from the watch time gives the correct time.

AI explanation

From 6:10 am on Sunday to 2:50 pm on Wednesday, 72 hours and 40 minutes have passed, which is 72 and two-thirds days. At a gain of 12 minutes per day, the total time gained is 12 times 72 and two-thirds, equaling 872 minutes or 14 hours and 32 minutes. Subtracting this 14 hours and 32 minutes from the displayed time of 2:50 pm on Wednesday gives the correct time of 2:10 pm.

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