30 trucks are loaded with 40t each of wet containing 30% moisture. En-route to the smelter it is reported a rainfall of 35mm of which 20% has evaporated due to the high temperature reported in the area after rain. A second rainfall equivalent to X% of the first moisture before the first rainfall has been reported. The trucks are 3m wide and 5m long. 2.1 Establish the equation of water to be removed if 2%. please explain the conversions of si units