Multiple choice

A watch gains 5 seconds in 3 minutes and was set right at 8 AM. What time will it show at 10 PM on the same day?

  1. 10: 27: 41 AM

  2. 8: 51: 04 AM

  3. 9: 45: 15 PM

  4. 10: 23: 20 PM

  5. none
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The watch gains 5 seconds every 3 minutes, which is 100 seconds per hour. From 8 AM to 10 PM is 14 hours. Total gain = 14 * 100 = 1400 seconds. 1400 seconds = 23 minutes and 20 seconds. Thus, the watch shows 10:23:20 PM.

AI explanation

The total time from 8 AM to 10 PM is 14 hours, which equals 840 minutes. Using the unitary method, if the watch gains 5 seconds in 3 minutes, it gains (840 / 3) * 5 = 1400 seconds. Converting 1400 seconds gives 23 minutes and 20 seconds, which when added to 10:00 PM results in 10:23:20 PM.

Keep practicing — related questions