An elevator descends into a mine shaft at the rate of 8 metre per minute if the distance starts from 20 m above the ground level find out the time taken by the elevator tourist 300m
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Rate of decreasing = 8m per min
20 m above ground level = +20m
300m below ground level = -300m
Total distance to be covered = 20 - (-300)
= 20 + 300
= 320m
Now, we will apply unitary method.
8m = 1 min
1m = 1/8min
320m = 1/8 × 320
= 40 min
Time taken by the elevator to reach its place is 40 min.
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