Depression in freezing point is related to the molality, therefore, the molality
of the solution with respect to ethylene glycol =
moles of ethylene glycol
mass of water in kilogram
Moles of ethylene glycol = 
1
45 g
62 g mol  = 0 73 mol
Mass of water in kg = 
1
600g
1000g kg = 0 6 kg
Hence molality of ethylene glycol = 
0 73 mol
0