If the question is to convert 2378cm^3 in `l and ml`,then what should be the answer - a) 2l and 378ml or b) 2.378 l and 2378ml.

You have to know that 1 litre = 1000cm cube and 1metre cube = 1000 litres.... ........ Therefore 2378 cm cube= 2378/1000= 2.738 litre ..............or 2 litres and 378 ml.............. It is given that answer should be in l and ml therefore option a is correct one.....................2l and 378ml....... Hope it helps.....