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5 September, 15:57

A student uses a submarine to study ocean life. She begins at sea level, which is at an elevation of 0 feet. She travels down for 90 seconds at a speed of 3.5 feet per second. She then travels directly up for 30 seconds at a speed of 2.2 feet per second. After this 120-second period, how much time, in seconds, will it take for the scientist to travel back up to sea level at the submarines maximum speed of 4.8 feet per second

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  1. 5 September, 16:16
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    it would take the student 51.9 seconds to travel back up to sea level

    Step-by-step explanation:

    90 (3.5) 315ft deep

    30 (2.2) 66 ft up

    now shes 249 ft deep

    249 divided by 4.8

    it would take the student 51.9 seconds to travel back up to sea level
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