A sandpit with a length of 5 meters, a width of 3.5 meters and a depth of 0.4 meters was dug on the school playground. 1.7 tons of sand are needed per cubic meter. How many tons of sand are needed to fill this bunker?
学校操场上挖了一个长5米，宽3.5米，深0.4米的沙坑．每立方米需要沙子1.7吨，这个沙坑共需多少吨沙子可以填满？
<gadget id="calculator">5 * 3.5 * 0.4 * 1.7</gadget>
<output>11.9</output>

<result>11.9</result>