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8 January, 12:51

An elevator descends into a mine shaft at the rate of 6 m/min. If the descendstarts from 20 meter above the ground level, how long will it take to reach - 340m?

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  1. 8 January, 15:34
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    It has to travel 20 meters before it gets to ground level, then another 340 meters till it reaches - 340 ... so it has to travel a total of 360 meters

    and if it descends at a rate of 6 meters per minute ...

    360/6 = 60 minutes ... or 1 hr to reach - 340 <==
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