A car travels 240 km in 4 hours. According to this calculation, how many hours will it take to drive 135 kilometers? Solution ratio.
一辆汽车4小时行驶了240千米．照这样算，行驶135千米，要多少小时？解比例．
<gadget id="calculator">240 / 4</gadget>
<output>60</output>

<gadget id="calculator">135 / 60</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>