A clock is 4 minutes slow at 9:00 PM and 10 minutes slow at 3:00 AM (next day). At what time (in PM) will it show the correct time?
Show answer & explanation
Correct answer: B
Explanation
In 6 hours, clock goes from 4 to 10 minutes slow ⇒ total 6 minutes ⇒ 1 minute per hour
Correct time occurs when error becomes 0 ⇒ time to recover 4 minutes = 4 hours
9:00 PM − 4 hours = 5:00 PM
Correct Answer: 5:00