How long does it take for a train to travel 135 kilometers in 3 hours and another train to travel 225 kilometers at the same speed? (Solve with ratio)
一列火车3小时行135千米，另一列火车用同样的速度行225千米，需要多少时间？(用比例解)
<gadget id="calculator">135 / 3</gadget>
<output>45</output>

<gadget id="calculator">225 / 45</gadget>
<output>5</output>

<result>5</result>