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Losing Time

Math brain teasers require computations to solve.

 

Puzzle ID:#4144
Fun:*** (2.24)
Difficulty:** (1.9)
Category:Math
Submitted By:librashorty***
Corrected By:MarcM1098

 

 

 



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?

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Answer

12:11pm; since the clock is losing 6 minutes every hour, for every real hour which has passed, the clock will only show 54 minutes. Since the clock shows 10:39am, we know that 639 clock minutes have passed. This therefore equals 710 real minutes and hence 11 hrs 50 mins. The clock stopped 21 minutes ago, therefore the time must now be 12:11pm.
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