The pony went from A to B and came back again. He traveled 5 kilometers per hour when he went there, and traveled 30 kilometers per hour by car when he returned. It took a total of 3.5 hours to go back and forth. What is the distance from A to B? km?
小马从甲地去乙地又回来了，去时每小时行5千米，回时坐车每小时行30千米，去回共花了3.5小时，那从甲地到乙地的距离是多少千米？
<gadget id="calculator">30 * 3.5</gadget>
<output>105</output>

<gadget id="calculator">5 + 30</gadget>
<output>35</output>

<gadget id="calculator">105 / 35</gadget>
<output>3</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>