a) The remote operated underwater vessel ROPOS descends at a rate of $7$ meters per minute.
b) The pressure on ROPOS increases by $13$ Pascals for every meter ROPOS descends.
c) Therefore the pressure on ROPOS is increasing by $91$ Pascals every minute.
If the depth of ROPOS beneath the water is measured by s, pressure by P, time by t, and the standard units are units, then rewrite each of these sentences in Leibniz derivative notation:
a) dP/ds ds/dt dP/dt = m/min Pa/m Pa/min
b) dP/ds ds/dt dP/dt = m/min Pa/m Pa/min
c) dP/ds ds/dt dP/dt = m/min Pa/m Pa/min