An elevator descends into a mine shaft at the rate of 6 m/min. If the descent starts from 10 m above ground level, how long will it take to reach −350 m
A
40 minutes
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B
50 minutes
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C
60 minutes
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D
70 minutes
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Solution
The correct option is C60 minutes Distance descended is denoted by a negative integer,
Initial height =+10m
Final Depth =−350m
Total distance to be descended by the elevator =(−350)−(+10)=−360m
Given, the time is taken by the elevator to descend −6m=1minute
Thus, time taken by the elevator to descend −360m=(−360)(−6) ------- [from the formula : speed=distancetime]