A car travels from A to B in 3 hours (2/5). At this time, it is still 45 kilometers away from the midpoint. How many kilometers does this car travel per hour?
一辆汽车从甲地到乙地，3小时行全程的(2/5)，这时离中点还有45千米，这辆汽车每小时行多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">45 / (1/10)</gadget>
<output>450</output>

<gadget id="calculator">(2/5) / 3</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">450 * (2/15)</gadget>
<output>60</output>

<result>60</result>