You have the misfortune to own an unreliable clock.This one loses exactly 20 minutes every hour.It i

题目

You have the misfortune to own an unreliable clock.This one loses exactly 20 minutes every hour.It is now showing 8:00 a.m.and you know that it was correct at midnight,when you set it.The clock stopped 10 hours ago,what is the correct time now?

答案

Solution:The clock shows 8:00 am.It means 8×60 = 480 min past by the clock.The actual time past by normal clock = (480÷40)×60 = 720 min = 12hrThe time delayed is 12 - 8 = 4hr.We also know the clock...