A score is twenty, and fourscore is therefore eighty.
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A score means 20, so fourscore and seven years is 87 years (20*4 + 7,) and threescore and six days is 67 days (20*3 + 7)
Time period = 1 / frequency. Frequency = 1 / time period.
Time period = 1 / frequency. Frequency = 1 / time period.Frequency and period are mutual reciprocals.
Average speed over a period of time = (distance covered in a period of time) divided by (time it took to cover the distance).
When the elevator starts moving down, the time period increases. But when the elevator is descending at a constant velocity, the time period returns to its normal.