The school built a new sand pit with a length of 5 meters and a width of 1.8 meters, and prepared to fill it with 40 cm thick sand. Each cubic meter of sand weighs about 1.5 tons. How many tons of sand should be filled in this bunker?
学校新建一个长5米、宽1.8米的沙坑，准备在里面填40厘米厚的沙．每立方米的沙约重1.5吨，这个沙坑大约要填多少吨的沙？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 * 1.8 * (2/5) * 1.5</gadget>
<output>5.4</output>

<result>5.4</result>