It takes 6 hours for a steamship to travel from port A to port B at a speed of 40 kilometers per hour. When returning, the speed increases by 10 kilometers per hour. How many hours does it take to return from port B to port A?
一艘汽船以每小时40千米的速度从甲港开往乙港，需用6小时．返回时，速度每小时提高了10千米，从乙港返回甲港需用几小时？
<gadget id="calculator">40 * 6</gadget>
<output>240</output>

<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">240 / 50</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>