A Scientist Uses A Submarine To Study Ocean Life. She Begins A Sea Level, Which Is At An Elevation Of 0 Feet. She Travels Straight Down For 90 Seconds

A scientist uses a submarine to study ocean life. She begins a sea level, which is at an elevation of 0 feet. She travels straight 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 one 120-second period , How much time, in seconds, will it take for the scientist to travel back to sea level at the submarines maximum speed of 4.8 ft./s? Round your answer to the nearest 10th of a second.

Answer:

51.9 sec

Step-by-step explanation:

90 sec (\frac{3.5 ft}{sec} ) = 315.0 ft.\\30 sec (\frac{2.2 ft}{sec} ) = 66.0 ft.\\\\315 ft.- 60 ft. = 249 ft.\\\\249 ft. (\frac{sec}{4.8 ft} ) = 51.875 ft.


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