Question 24.
Kim’s wristwatch always shows the correct time, including ‘am’ and ‘pm’. Jim’s watch is identical to Kim’s watch in all aspects except its pace, which is slower than the pace of Kim’s watch. At 12 noon on January 1st, Jim sets his watch to the correct time, but an hour later, it shows 12:57 pm. At 12 noon on the next June 1st, Jim resets his watch to the correct time.
On how many instances between, and including 12 noon on the two dates mentioned, do Jim’s and Kim’s watches show the exact same time, including the ‘am’ and the ‘pm’?
On how many instances between, and including 12 noon on the two dates mentioned, do Jim’s and Kim’s watches show the exact same time, including the ‘am’ and the ‘pm’?
A
10
B
7
C
15
D
9
Question Explanation
Text ExplanationVideo Explanation
The pace of Jim's watch is slower by 3 minutes in comparison with Kim's watch for every one hour. The difference increases as the hours pass by.
The time and "am" and "pm" of the watch coincide when the difference between the two clocks reduces to 24 hours. The two clocks display the same time including am and pm.
For a difference of 24 hours, the clock needs to lag by 1440 minutes.
For every one hour, the clock lags by 3 minutes. Hence in order to have a difference of 1440 minutes, it takes . This is equivalent to 20 days of time.
Hence for every twenty days, they display the same time.
In the period of Jan 1 and June 1, there are 150 days which includes 7, 20-day intervals. Along with the 7 times once on Jan 1st and once on June 1st, they display the same time.
A total of 9 times.
The time and "am" and "pm" of the watch coincide when the difference between the two clocks reduces to 24 hours. The two clocks display the same time including am and pm.
For a difference of 24 hours, the clock needs to lag by 1440 minutes.
For every one hour, the clock lags by 3 minutes. Hence in order to have a difference of 1440 minutes, it takes . This is equivalent to 20 days of time.
Hence for every twenty days, they display the same time.
In the period of Jan 1 and June 1, there are 150 days which includes 7, 20-day intervals. Along with the 7 times once on Jan 1st and once on June 1st, they display the same time.
A total of 9 times.
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