Question

After how much time will the first clock show the time in the second clock, for the second time?

Answer 1

Time shown by the first clock = 09:00
Time shown by the second clock = 01:00
Time difference between the two clocks = Time difference between 09:00 and 12:00 + Time difference between 12:00 and 01:00 = 3 + 1
= 4 hours
Now, we know that the clock shows the same time after every 12 hours.
The second time when the first clock will show 1 O' clock = 4 + 12
= 16 hours