An elevator descends into a mine shaft at the rate of 5m/min. The descent starts from 20 m above sea level. Where will it reach in 20 minutes ? How long will it take to reach a depth of -350 m?
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Answer:
total distance covered = total time taken × speed
= 20×5
= 100 m below ground
total distance to be covered = 370 m
time taken = 370/5
= 74 min
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