Question

Ten minutes after a submarine is launched from a research ship,it is 25 meters below the surface. After 30 minutes, the submarine has descended 75 meters. At what rate is the submarine diving?

Answer 1

25/10=75/30=2.5

this is how many meters per minute.
for m/s:

2.5/60=.0417m/s

Answer 2

2.5 meters per minute
divide 25 by 10 and get your answer