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Question

# 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 C 60 minutesDistance descended is denoted by a negative integer,Initial height =+10 mFinal Depth =−350 mTotal distance to be descended by the elevator =(−350)−(+10)=−360 mGiven, the time is taken by the elevator to descend −6 m=1 minuteThus, time taken by the elevator to descend −360 m=(−360)(−6) ------- [from the formula : speed=distancetime]=60 minutes

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