60 minutes in an hour, and 60 seconds in a minute. So:
9 × 60 × 60 = 32,400 seconds
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9 hours is equal to 32,400 seconds. This is calculated by multiplying the number of hours by 60 (to convert to minutes) and then multiplying by 60 again (to convert to seconds).
There are 32,400 seconds in 9 hours. This is calculated by multiplying 9 hours by 60 minutes (to convert hours to minutes), then by 60 seconds (to convert minutes to seconds).
129 minutes is equal to 2 hours and 9 minutes.
A nanosecond is one billionth of a second, or 1/1,000,000,000 seconds. Therefore, 9 nanoseconds is nine billionths of a second, or 9/1,000,000,000 seconds, or 9.0 x 10-9 seconds.
If you have the distance (in miles) in 9 hours, divide the distance by 9.
To convert seconds to nanoseconds, you would multiply the number of seconds by 1,000,000,000 (since 1 second is equal to 1,000,000,000 nanoseconds). For example, 1 second would be equal to 1,000,000,000 nanoseconds.