Question

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

Answer 1

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

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