There are two types of trucks, A and B, and the interior sides and length, width and height of their compartments are 4m, 2.1m, 0.6m and 2.4m, 2m, 0.7m respectively. A pile of gravel is carried by a type A truck, and the average height of the gravel in the compartment is 0.4m. If this pile of gravel is carried by a B-type truck, can it be loaded? If it can be loaded, how many meters is the average height of the gravel in the compartment?
有A、B两种型号的卡车，它们车厢内边和长、宽、高分别是4m，2.1m，0.6m和2.4m，2m，0.7m．将一堆碎石用A型卡车运载，车厢内碎石的平均高度为0.4m．如果将这堆碎石有B型卡车运载，装得下吗？如果装得下，车厢内碎石的平均高度有多少米？
<result>0.7</result>