Discussion
A watch gains 12 minutes per day. If the watch was slow by 5 minutes at 7:00 a.m. on Monday, what time will this watch show at 7:00 p.m. on next Monday?
Answer: C
The watch will show 8:25 p.m.
From 7:00 a.m. Monday to 7:00 p.m. the next Monday is 7 days and 12 hours, that is 7.5 days. At 12 minutes a day the watch gains 7.5 × 12 = 90 minutes.
It started 5 minutes slow, so its net error at the end is 90 - 5 = 85 minutes fast. The true time is 7:00 p.m., so the watch shows 7:00 p.m. + 1 hour 25 minutes = 8:25 p.m.
8:30 p.m. ignores the initial 5 minutes slow, and the 5 p.m. options treat the gain as a loss.
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