Question

A submarine starts at sea level and sinks 1/5 mile an hour. Later it rises 1/5 miles. What is the depth in miles after the hour

Answer 1

After sinking and then rising for an equal distance of 1/5 mile, the submarine returns to its starting depth, which is sea level.

Step-by-step explanation:

The question pertains to calculating the depth a submarine is at after sinking and rising for certain periods at a constant rate. Initially, the submarine sinks at a rate of 1/5 mile per hour, then it rises back up the same distance of 1/5 mile. To determine the depth after these movements, you would subtract the distance risen from the distance sunk since they are equal in magnitude, resulting in no change in depth from the starting point. Therefore, after sinking 1/5 mile and subsequently rising 1/5 mile, the submarine would be at the same depth it started from, which is sea level.