A passenger car drives from point A to point B, and a truck drives from point B to point A. They meet each other in 3 hours. After the two cars meet, they continue to drive at the same speed for 1 hour. At this time, the bus has traveled the entire distance (3/ 4), the truck is still 100km away from A, find the distance between A and B.
一辆客车从甲地开往乙地，一辆货车从乙地开往甲地，3小时相遇，两车相遇后都继续按原速行驶了1小时，这时客车行了全程的(3/4)，货车离甲地还有100km，求甲、乙两地的距离．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 16</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">(3/16) * 3</gadget>
<output>9/16 = around 0.5625</output>

<gadget id="calculator">(3/4) - (9/16)</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">(3/4) / 4</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">1 - (9/16)</gadget>
<output>7/16 = around 0.4375</output>

<gadget id="calculator">3 / (7/16)</gadget>
<output>48/7 = around 6.857143</output>

<gadget id="calculator">(3/16) * (48/7)</gadget>
<output>9/7 = around 1.285714</output>

<gadget id="calculator">1 / (9/7)</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">(3/16) * (7/9)</gadget>
<output>7/48 = around 0.145833</output>

<gadget id="calculator">1 - (7/48) - (7/16)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">100 / (5/12)</gadget>
<output>240</output>

<result>240</result>