The inner wall of a train carriage is 12 meters long, 3.5 meters wide, and 2.5 meters high. Each cubic meter of coal weighs about 2.4 tons. How many tons does the coal that fills such a carriage weigh approximately?
一节火车车厢内壁长12米，宽3.5米，高2.5米，每立米煤约重2.4吨，装满这样一节车厢的煤约重多少吨．
<gadget id="calculator">12 * 3.5 * 2.5 * 2.4</gadget>
<output>252</output>

<result>252</result>