A unit of time cannot be compared to a unit of length.
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There are 12 inches in a foot and 60 seconds in an inch:(5 minutes / 1 foot) * (60 seconds / 1 minute) * (1 foot / 12 inches) = 25 seconds per inch(Notice that the minute and foot units cancel out leaving seconds per inch.)
A foot-pound is not a pound per foot, it is a pound times a foot. So the units are not the same. The question has no answer. It is like asking how to convert feet to pounds or seconds to inches.
Answer: 2.8 seconds has 2.8 seconds.
1 nanosecond = 10-9 sec = 0.000000001 sec = 1 billionth of a sec. (Roughly the time it takes light/radio to travel one foot.)
900,000 seconds = 900,000 seconds.