An elevator is 150 m above the ground level and it descends at the rate of 5 m/min. Find the time tax
to reach 150 m below the ground level
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as it takes 5m/sec time to go 150m in till grnd level it would take 150/5 that is 30sec's and more 150 m it would take more 30sec therefore, it takes 30+30=60sec total
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