Sammie is a researcher on planet Zerpa. Like Earth, planet Zerpa has trains that travel at different speeds depending on the gross mass of the train. Void of contents, all the trains on the planet are identical in mass. Gold is the most prominent metal on Zerpa, and trains carry the gold from the mines to the refiner daily. Before it is loaded onto the train, the gold is liquified. Sammie founnd that with every additional 4kg of liquid gold, the train slows down by 5% of the speed could travel. if it were empty. For example, if the train is empty and can travel at 100km/hr and it carries 4kg of gold, it travels at 95km/hr. If the train carries 8kg of gold, it travels at 90km/hr. She has found that a train that is completely full of gold can travel at 54km/hr, while a trainn half full can travel at 72m/hr. How many litres of liquid gold can a full train hold if Sammie also found that 0.9g of liquid gold is equivalent to 1.0ml(rounded to the nearest tenth of a litre)?