The road between the two towns A and B is 75 kilometers long. Xiao Wang drives a car for 30 kilometers to share 2 liters of gasoline. According to this calculation, how many liters of gasoline will be needed for the car to travel the entire distance?
甲乙两个小镇的公路长75千米．小王驾驶一辆汽车行驶30千米共用去2升汽油．照这样计算，这辆汽车行完全程还需要多少升汽油？
<gadget id="calculator">2 / 30</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">75 - 30</gadget>
<output>45</output>

<gadget id="calculator">(1/15) * 45</gadget>
<output>3</output>

<result>3</result>