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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 minutes
Distance descended is denoted by a negative integer,

Initial height =+10 m

Final Depth =350 m

Total distance to be descended by the elevator =(350)(+10)=360 m

Given, the time is taken by the elevator to descend 6 m=1 minute

Thus, time taken by the elevator to descend 360 m=(360)(6) ------- [from the formula : speed=distancetime]

=60 minutes

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