The total distance descended after four minutes is 1000 ft.
Two variables are said to be proportional if their ratios are equivalent. That means that for the variables to be proportional then their ratios must be equivalent.
Given that the mine elevator descends at a rate of 200 ft per minute, hence this is a proportional relationship.
Therefore:
Total distance = Rate of descend × amount of time taken
Total distance = 250 ft per minute × 4 minutes = 1000 ft.
Therefore the total distance descended after four minutes is 1000 ft.
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