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Question:

The radar system beeps once every second. How many times will it beep in 3 days?

A 259,200
Explaination

There are 60 seconds in a minute and 60 minutes in an hour. So each day has: 24 x 60 × 60 = 86,400 seconds
Multiply this by 3 to find the number of seconds in 3 days:
3 × 86,400 = 259,200 seconds.