person goes from place A to place B. He originally planned to walk 50 kilometers a day, and he finished the journey in 9 days. He actually arrived a day and a half earlier than the original plan. How many kilometers did he actually walk more than the original plan?
某人由甲地去乙地，原计划每天走50千米，9天后走完全程，实际比原计划提前一天半到达，实际比原计划每天多走多少千米？
<gadget id="calculator">9 - 1.5</gadget>
<output>7.5</output>

<gadget id="calculator">9 / 7.5</gadget>
<output>1.2</output>

<gadget id="calculator">50 * 1.2</gadget>
<output>60</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<result>10</result>