From a cruising depth of 75 m below sea lever (bsl) the nautilus descended to 105 m bsl and then rose to 80 m bsl. what is the total vertical distance the nuatilus traveled?
another question -
a red kangaroo jumps along 40 km/h. at this rate how long would it take to jump 2 km in minutes? ,

If the ship started out at -75M and descended to -105M, it traveled 30M. If it then went from -105M to -80M, it traveled 25M vertically. Therefore, the total vertical distance traveled, regardless of direction, was 30 + 25 = 55 meters. If the kangaroo jumps at 40 km/h, then to travel 2km it would require 2/40 = 1/20 = 0.05 hours. 60*0.05 = 3 minutes. So it would take the kangaroo 3 minutes to go 2 km.