A certain slow clock loses 15 mins 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? Show your work.

Question

Also, does to lose an hour mean to go forward or fall back an hour?

Scott · Accepted Answer

losing time means running too slow

when an hour has passed, the clock has only moved 45 min
it is running at 3/4 speed (45/60)

so when it shows an hour has passed,
an hour and 20 min (4/3 hr) has actually passed

the correct time is...10:20 AM

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