The school bunker is 5 meters long, 3 meters wide, and 0.5 meters deep. Each cubic meter of sand weighs 1,400 kilograms. How many tons of sand are needed to fill the bunker?
学校沙坑长5米，宽3米，深0.5米，每立方米沙重1400千克，填满这个沙坑需要沙多少吨？
<gadget id="calculator">5 * 3 * 0.5</gadget>
<output>7.5</output>

<gadget id="calculator">1.4 * 7.5</gadget>
<output>10.5</output>

<result>10.5</result>