A car travels from A to B. If the speed increases (1/5), it takes 7.5 hours to arrive. How many hours did it originally plan to take?
一辆车从甲地去乙，如果速度提高(1/5)，现在7.5小时到达，原计划用几小时到达？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">7.5 * (6/5)</gadget>
<output>9</output>

<result>9</result>