An elevator descends into a mine shaft at the rate of 7m per minute .If it descent starts from 20 m above the ground level ,find the time taken by the elevator to reach -400m.
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The elevator have travel a distance of 400+20=420m
so.. time take to reach -400 is =420÷7= 60min
so.. time take to reach -400 is =420÷7= 60min
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