A certain slow clock loses 15 minutes every hour. Suppose the clock is set to the correct time at 9 AM.....?
A certain slow clock loses 15 minutes every hour. Suppose the clock is set to the correct time at 9 AM. What will the correct time be when the slow clock first shows 10 AM? Please explain me, don't just post the answer. Why isn't it 9:45?
- lavalamp3773Lv 71 decade agoFavorite Answer
If the slow clock loses 15 mins every hour, then that means after 60 mins, it shows 45 mins have elapsed.
45 / 60 = 3 / 4
So the slow clock runs at 3/4 the rate it should.
Therefore if the slow clock shows an elapsed time of 60 mins, we can calculate the real elapsed time R, as:
R * 3 / 4 = 60
R * 3 = 60 * 4
R = 60 * 4 / 3
R = 80 mins
So if the slow clock was correct at 9 AM, and it's now showing 10 AM, the real time is 10:20 AM.