Multiple choice

A watch which gains $5$ seconds in every $3$ minutes is set right at $6$ a.m. What is the true time in the afternoon of the same day when the watch indicated $3:15$ p.m.?

  1. 3:00 pm

  2. 3:05 pm

  3. 3:10 pm

  4. 3:07 pm

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The watch gains 5 seconds every 3 minutes, which is 100 seconds per hour. From 6 a.m. to 3:15 p.m. is 9.25 hours. Total gain = 9.25 * 100 = 925 seconds = 15 minutes and 25 seconds. Subtracting this from 3:15 p.m. gives approximately 3:00 p.m.