A car starts from A, travels 45 kilometers per hour, and arrives at B in 4 hours. If you travel 60 kilometers per hour, how many hours can you reach B? (Solve with ratio)
一辆汽车从甲地出发，每小时行45千米，4小时到达乙地．如果每小时行60千米，几小时可到达乙地？(用比例解)
<gadget id="calculator">45 * 4</gadget>
<output>180</output>

<gadget id="calculator">180 / 60</gadget>
<output>3</output>

<result>3</result>