A truck compartment is 3.5 meters long and 2.5 meters wide. Sand 0.4 meters high is installed in the carriage. 1 cubic meter of sand weighs 1.2 tons, how many tons of sand does this truck hold?
一辆卡车车厢长3.5米，宽2.5米．在车厢里装了0.4米高的沙子．1立方米沙子重1.2吨，这辆卡车装了多少吨沙子？
<gadget id="calculator">3.5 * 2.5 * 0.4 * 1.2</gadget>
<output>4.2</output>

<result>4.2</result>