Multiple choice

A clock was set right on Monday at 3:00 a.m. but gains 2 minutes every hour. What time will the clock show when the actual time is 7:30 p.m. on Tuesday?

  1. 8:48 p.m.

  2. 8:45 p.m.

  3. 8:51 p.m.

  4. 9:10 p.m.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

From Monday 3:00 a.m. to Tuesday 7:30 p.m. is 24 + 16.5 = 40.5 hours. The clock gains 2 minutes per hour, so total gain = 40.5 * 2 = 81 minutes = 1 hour 21 minutes. 7:30 p.m. + 1 hour 21 minutes = 8:51 p.m.

AI explanation

The actual time difference from Monday 3:00 a.m. to Tuesday 7:30 p.m. is 40.5 hours. Using the faulty clock method, we multiply 40.5 hours by the 2 minutes the clock gains per hour to get a total gain of 81 minutes. Adding 1 hour and 21 minutes to the actual time of 7:30 p.m. gives the time shown on the clock as 8:51 p.m.

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