Xiaofang goes to the market from home. If she walks 1.5 kilometers more than the original plan per hour, she only needs (4/5) of the original time; if she walks 1.5 kilometers less than the original plan per hour, then the required time How much is the original time.
小芳从家去赶集，如果她每小时比原计划多走1.5千米，则只需原来时间的(4/5)；如果她每小时比原计划少走1.5千米，那么，所需时间是原时间的多少．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">1.5 * 4</gadget>
<output>6</output>

<gadget id="calculator">6 - 1.5</gadget>
<output>4.5</output>

<gadget id="calculator">5 / 4.5 / 5</gadget>
<output>0.222222</output>

<gadget id="calculator">6 * 0.222222</gadget>
<output>1.333332</output>

<result>1.333332</result>