A lift descends into an underground floor at the rate of 6 metres per minute. If the descent starts from 10 metres above the ground level, how much time will it take to descend 350 metres underground?

30 minutes

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50 minutes

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1 hour

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1 hour 30 minutes

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Solution

The correct option is C
1 hour

A lift is 10 m above the ground.

The lift has to descend 350 m underground.

The total distance the lift has to descend = 10 + 350 = 360
Given that the lift descends at the rate of 6 m/minute.

Total time required by the lift to descend from 10 m above the ground to 350 m below the ground $= \frac{360}{6} = 60 m i n u t e s = 1 H o u r$

$∴$ The lift will take 1 hour to descend from 10 m above the ground to 350 m below the ground.

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