an analogue clock is gaining three minutes every hour. If you set it to the correct time at 6pm on Saturday, when will it show the correct time again?
Answer:
After 20 hours the clock will show 3*20 = 60 min = 1 hr more
Since the clock is analogue after 12 hours it will show the same time hat is 6 am and 6 pm are shown the same way.
After 20*12 = 240 hr = 10 days the clock will show 12 hr more but since 6 am and 6 pm are shown the same after 240 hr = 10 days the clock will show the correct time again.
The correct time will be shown on Monday 6 pm.