The length of the fuel tank is 8 decimeters, the width is 5 decimeters, and the height is 3 decimeters. Every 4 liters of oil can be used for the tractor to work for 1 hour. If the fuel tank is filled with oil, how many hours can the tractor work for?
油箱长8分米，宽5分米，高3分米，每4升油可供拖拉机工作1小时，如果把这个油箱装满油，可供拖拉机工作多少小时？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 * 5 * (3/4)</gadget>
<output>30</output>

<result>30</result>