The actual length of a mobile phone is 10 cm. On the poster of the mobile phone with a scale of 30:1, how many meters is the length of the mobile phone?
一手机实际长10厘米，在比例尺30：1的该手机海报上，手机长多少米？
<gadget id="calculator">30 / 1</gadget>
<output>30</output>

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

<gadget id="calculator">300 / 100</gadget>
<output>3</output>

<result>3</result>