How many minutes are in twenty-four hours?
There are 86,400 seconds in one day (or 24 hours). How? Multiply 24 hours in a day by 60 minutes in an hour by 60 seconds in a minute.
Which is the first day of the week Sunday or Monday?
Sunday is the first day of the week. See the related question below.
A pendulum clock at high altitudes runs?
Slower (lower frequency, really), due to the reduced gravity.
How many weeks are in a year including extra days?
So there is one extra day and this is on a leap year. 366 days is 52 weeks with 2 days left over.
What is week 28 on calendar 2010?
Week 28 on calendar 2010 starts on 4th June and ends on 10th June 2010.