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 59 seconds at a speed of 4.3 feet per second. She then ascends for 103 seconds at a speed of 2.1 feet per second. After this 162-second period, how much time, in seconds, will it take for the scientist to travel back to sea level at 3.4 feet per second? Round your answer to the nearest tenth of a second.