A submarine is at 20 m below the ground level. If it descends at the rate of 13 m/min, how long will it
take to reach-2400 m?
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Distance it needs to travel = 2400 - 20 = 2380m
Speed = 13m/min
Time = Distance/Speed = 2380/13 ≈ 183 min = 3.05 hr
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