truck drives from city A to city B, traveling 70 kilometers per hour, and travels for 6 hours. Because of the increased speed, it takes 2 hours less to return. What is the velocity when returning?
一辆货车从甲城开往乙城，每小时行70千米，行驶了6小时，返回时由于速度提高了，少用了2小时．返回时的速度是多少？
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">70 * (3/2)</gadget>
<output>105</output>

<result>105</result>