A submarine is 50 m below sea level. It goes down a further 280 m to sit on a rock. What is the depth of the rock below sea level?
A submarine is travellingat a speed of 220 mph at a depth of 1600 miles from sea level . To avoid detection ,it further goes down 220 miles . Later when it reaches safe zone , it ascends 440 miles . Finally ,what is the depth of submarine from sea level ?