An elevator desends into a mine shaft at the rate of 13m/min .if the desend start from 20m above the ground level, how long will it take reach -240m?
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Descends starts from 20 m above the ground level. To find the time required to reach 370 m below ground level. Here, since the descend starts from 20 m above ground level, the elevator will have to cover an extra distance of 20m. So, total distance = 370 + 20 = 390 m.
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Answer:
total distance= -240+20m=-260m
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