I was recently given a new watch for my birthday.
However, as usual with my presents, it was quite useless as it loses 6 minutes every hour.
I set it using my friend's accurate watch at midnight, and it now shows 10:39am.
I know that the watch stopped 21 minutes ago, so what is the correct time now?
Puzzle Copyright © Kevin Stone
workings hint hide answer print
Share link – www.brainbashers.com
Answer
12:11pm.
Reasoning
The watch now shows 10:39am, so we know that (10 x 60 + 39) 639 watch minutes have passed.
Since the watch is losing 6 minutes every hour, for every real hour that has passed, the watch will show 54 minutes.
So, 639 ÷ 54 ≈ 11.8333 real hours have passed.
This equals 710 minutes, which is 11 hours and 50 minutes (11:50am).
The watch stopped 21 minutes ago, therefore the time must now be 12:11pm.
Note: BrainBashers has a Dark Mode setting.