The car travels the whole journey (2/5) in 4 hours, 45 kilometers per hour, how many kilometers is the whole journey.
汽车4小时行了全程的(2/5)，每小时行45千米，全程长多少千米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 4</gadget>
<output>1/10 = around 0.1</output>

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

<result>450</result>