A ship sails from port A to port B at 25 kilometers per hour and arrives in 12 hours. If sailing 30 kilometers per hour, how long will it take to reach port B? (solution by equation)
一艘船从A港驶往B港，每小时航行25千米，12小时到达．如果每小时航行30千米，多少小时到达B港？(用方程解)
<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<gadget id="calculator">300 / 30</gadget>
<output>10</output>

<result>10</result>