The telephone charge standard in a certain city is: 0.20 yuan for local calls within 3 minutes (including 3 minutes), 0.10 yuan per minute for more than 3 minutes; 0.3 yuan per minute for long-distance calls. Uncle Li first made a local call, which lasted 6 minutes, and then made a long-distance call, which cost a total of 1.7 yuan. How much is Uncle Li's long-distance call time?
某市电话收费标准为：市内电话3分钟以内(含3分钟)收费0.20元，超过3分钟每分钟0.10元；长途电话每分钟0.3元．李叔叔先打了一个市内电话，通话时间是6分，随后又打了一个长途电话，总共花了1.7元．李叔叔的长途电话通话时间是多少分？
<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">3 * 0.1</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 + 0.2</gadget>
<output>0.5</output>

<gadget id="calculator">1.7 - 0.5</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 / 0.3</gadget>
<output>4</output>

<result>4</result>