“A scientist uses a submarine to study ocean life. She begins at sea level, which is 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 120 second period, how much time, in seconds, will it take for the scientist to travel back to sea level at the submarine’s maximum speed of 4.8 feet per second? Round your answer to the nearest tenth of a second.” I need this done soon, please help.

## What is speed?

rateof change of position of an object in any direction.Speedis measured as theratioof distance to the time in which the distance was covered.speed – distance relationship, the time taken for the scientist to travel back to sea level would be 51.9 secondsDistance = Speed × timeDistance covered= 90 × 3.5 = 315 feetDistance covered= 30 × 2.2 = 66 feetMaximum speed= 4.8 feet per secondTime taken = Distance / speedTime taken= 249 ÷ 4.8 = 51.875 seconds