Xiao Ming's height is 1.5 meters, and his shadow length is 2.4 meters. If the shadow of a tree is 4 meters long when measured at the same time and place, how tall is the tree? (Solve with ratio)
小明的身高1.5米，他的影长2.4米．如果同一时间、同一地点测得一棵树的影子长4米，这棵树有多高？(用比例解)
<gadget id="calculator">1.5 * 4</gadget>
<output>6</output>

<gadget id="calculator">6 / 2.4</gadget>
<output>2.5</output>

<result>2.5</result>