Benefits and Disadvantages of Statutory Corporation
An elevator d...
Question
An elevator descends into a mine shaft at the rate of 15m/min. If the descend starts from 10 m above the ground level, how long will it take to reach -140m.
A
8 minutes
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B
18 minutes
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C
38 minutes
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D
10 minutes
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Solution
The correct option is D 10 minutes Initial position of the Elevator is 10 m above the ground.
The elevator has to reach -140 m.
So, the elevator will have to descend 150 m in total to reach -140 m.
Given that the lift descends at the rate of 15 m/minute. ⇒ To descend 15 m → lift takes 1 minute ⇒ To descend 150 m → elevator takes 15015= 10 minutes ∴ The elevator will take 10 minutes.