Convert 238 cm to the unit km. 0.00238 km 0.238 km 2.38 x 105 km 2.38 x 107 km

238 cm = 0.002 38 km

Step 1. Convert centimetres to metres

238 cm × (1 m/100 cm) = 2.38 m

Step 2. Convert metres to kilometres

2.38 m × (1 km/1000 m) = 0.002 38 m

i think   the answer is c hope i'm right

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.