A car travels from point A to point B in 5 hours (5/12). At this time, it is still 40 kilometers away from the midpoint. How many kilometers per hour does the car travel on average?
一辆小汽车从A地到B地，5小时行了全程的(5/12)，这时距离中点还有40千米，这辆小汽车平均每小时行多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(1/2) - (5/12)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">40 / (1/12)</gadget>
<output>480</output>

<gadget id="calculator">(5/12) / 5</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">480 * (1/12)</gadget>
<output>40</output>

<result>40</result>