Losing Ten Minutes An Hour

A clock loses exactly ten minutes every hour. If the clock is set correctly at noon, what is the correct time when the clock reads 3:00pm?

3:36pm. For every 60 minutes of real time, the clock moves 50 minutes. Put another way, 60/50 = 1.2 real minutes per slow-clock minute.

In order for the clock to show 3:00pm, 180 of its slow minutes have to pass. 1.2 * 180 clock minutes = 216 real minutes or 3 hours and 36 minutes.

Posted in Brain Teasers


8 Comments on "Losing Ten Minutes An Hour"

Dustin says
October 4, 2014 @ 02:36

Take the answer out of the question! It ruins it!

Dan says
October 4, 2014 @ 07:18

My mistake. Thanks for letting me know.

Orla says
December 28, 2015 @ 11:42

Let t be the hours on the slow clock and T be the hours on the accurate clock. We are told that t=T-T/6. Set t=3 and solve for T.

ahmari says
August 27, 2016 @ 18:45

What about 5:00???

FTHRW8 says
November 3, 2016 @ 02:27

If a clock loses 10 minutes every hour, would it not be 2:30?

12 p.m.=12 p.m.
1 p.m.=12:50 p.m.
2 p.m.=1:40 p.m.
3 p.m.=2:30 p.m.


3×10=30 (30 minutes for the 3 hours, which means at 3 it would be 2:30)

The real answer is way technical and my mind does not grasp complex concepts

Me says
December 18, 2016 @ 11:51

you are thinking the real time is 3:00.
3:00 is what the clock is showing.
Hope this helps.

Olivia says
March 25, 2018 @ 17:25

The time shown is the time on the clock that is 10 minutes slow. They are asking what the actual time is when the incorrect clock is at 3:00 p.m.

Yeng says
July 13, 2018 @ 20:15

What is the answer set at 9am
loses 2 minutes every hour
correct time is 4pm the next day?

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