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CBSE Class 7 Answered

An elevator descends into a mine shaft at the rate of 9 m per minute. If the descent starts from 20 m above the ground level how long will it take to reach -250 m?
Asked by Sikerwar_Indore | 18 Sep, 2018, 08:36: PM
answered-by-expert Expert Answer
If the descent starts from 20 m above the ground level how long will it take to reach -250 m?
 
The distance to be descended by the elevator  = (-250) - (+20) = - 270 m
rate = begin mathsize 16px style fraction numerator distance space over denominator time end fraction
end style

- 9 = (-270) ÷ x
Therefore x = (-270) ÷ (-9)= 30 minutes
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