An elevator descends into a mine shaft at the rate of 10m/ minute. If the descent starts from 30 m above the ground level, how long will it take to reach -430 m?
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Time to reach -430m from ground level= -430/10
=43min
time to reach 30m from ground level = 30/10
=3min
Total time to reach -43m from 3m = 43+3=46min
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