20 milliseconds = 20 million nanoseconds.
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1 millisecond = 1,000 microseconds = 1,000,000 nanoseconds 10 milliseconds = 10,000,000 nanoseconds (10 million) = 107
nanoseconds.
20 decaseconds = 200,000 milliseconds.
20 minutes is equal to 20 x 60 = 1200 seconds. There are 1000 milliseconds in one second, therefore multiplying this by 1000 gives us 1200000 milliseconds.
(109 nanoseconds) / (20 feet) = 0.05 second per foot