Multiple choice

If your wrist watch was slow by 3 minutes at 8:00 a.m. on Saturday and was fast by 5 minutes at 2:00 p.m. on Sunday, when did your watch show the correct time?

  1. 6:45 p.m. on Sunday

  2. 7:15 p.m. on Saturday

  3. 6:15 p.m. on Sunday

  4. 4:45 p.m. on Sunday
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The total time from Saturday 8:00 a.m. to Sunday 2:00 p.m. is 30 hours. The watch gains 8 minutes (3 slow to 5 fast) in 30 hours. The watch shows the correct time when it has gained exactly 3 minutes, which takes (3/8) * 30 = 11.25 hours. 11.25 hours after Saturday 8:00 a.m. is 7:15 p.m. on Saturday.

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