TIME SEQUENCE
In time sequence, we have to detect exact time/a particular day/a particular day on the basis of several statements provided in the question.
To solve problems related to time
sequence, let us gather first the
following informations :
1 Minute = 60 seconds
1 Hour = 60 minutes
1 Day= 24 hours
1 Week = 7 days
1 Month = 4 weeks
1 Year= 12 months
1 Ordinary year = 365 days
1 Leap year =366 days
1 Century=100 years
Remember
• A day is the period of the earth’s
revolution on its axis.
• A ‘Solar year’ is the time taken the
earth to travel round the sun. It is equal to 365 days, 5 hours, 48 minutes and 47 1/2 seconds nearly.
• A ‘Lunar month’ is the time taken
by the moon to travel round the
earth. It is equal to nearly 28 days.
Leap Year
• If the number of a given year is
divisible by 4, it is a leap year.
Hence, the years like 1996, 2008,
2012 are leap years. But years like
1997, 1991, 2005, 2007 are not
divisible by 4 and therefore, such
years are not leap years.
• In a leap year, February has 29 days
• A leap year has 52 weeks and 2 days
Therefore, a leap year has 2 odd days.
Ordinary year
• An ordinary year has 12 months
• An ordinary year has 365 days,
• An ordinary year has 52 weeks and 1 day. Therefore, an ordinary year has 1 odd day
Century (100 years)
• A century has 76 ordinary years
and 24 leap years.
• A century has 5 odd days.
Odd days
Odd days in an ordinary year = 1
Odd days in a leap year=2
Odd days in 100 years = 5
Odd days in 200 years =(5×2) = 1 week + 3 days = 3
Odd days in 300 years =(5×3) = 2 weeks + 1 day=1
Odd days in 400 years =(5×4+1) = 21 days = 3 weeks + 0 day=0
Similarly, each 800, 1600, 2000, 2004, etc. has 0 odd days.
>> EXAMPLE 1. Neena returned home
after 3 days earlier than the time she had told her mother. Neena’s sister Veena reached five days later than the day Neena was supposed to return. If Neena returned on Thursday, on what day did Veena return?
Sol. Neena returned home on Thursday.
Neena was supposed to return 3
days later, i.e., on Sunday. Veena returned five days later from
Sunday. i.e., on Friday.
