A and B start from the same place to a certain place, A starts 1 hour earlier than B and arrives 2 hours later, A walks 4 kilometers per hour, B walks 6 kilometers per hour. Find the distance between the starting point and a certain place.
甲、乙两人从同一地点出发去某地，甲比乙早出发1小时而晚到2小时，甲每小时走4千米，乙每小时走6千米．求出发地与某地间距离．
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2) * 6</gadget>
<output>36</output>

<result>36</result>