Check your PC for viruses and so caled "jokes".
About up to an hour at max
It takes light exactly one hour to travel in 1 hour.
Depends on the time of year and place. When you are at the equator, the days are exactly 12 hours and the nights are exactly 12 hours.
Exactly 15 km per hour.
At every hour exactly, for example 'the train will leave at 1pm or 2pm and so on - on the hour.
Exactly 1 hour
No.
There are exactly 144,000 seconds in a 40 hour work week. There are 2,400 minutes in 40 hours and 144,000 second in 2,400 minutes.
Cleaning a car.
Exactly 100 miles
one hour
There are many free software packages on line that help you get rid of viruses, including malware bytes or superantispyware. Go into safe mode when you turn on your computer and download one of the free software virus scanners and put it into action. Safe mode is better because if you run your computer in regular mode, the virus may stop you from opening programs that can harm it. Run both scans to make sure the virus is gone. It can take an hour or more, depending on the number of files, so be patient and when the scans are done, reboot(restart) your computer and your computer should be back to normal.