The distance between port A and port B is 612 kilometers. The speed of the ship from port A to port B is 34 km/h. When returning, the speed is 2 km per hour. How long will it take to return?
甲、乙辆港口相距612千米，轮船从甲港口驶到乙港口速度为34千米/时，返回时每时加快2千米，回来要用几时？
<gadget id="calculator">34 + 2</gadget>
<output>36</output>

<gadget id="calculator">612 / 36</gadget>
<output>17</output>

<result>17</result>