Xiao Ming walks 60 centimeters in one step. He walks 135 steps from the first tree to the ninth tree. What is the distance between the first tree and the ninth tree?
小明一步走60厘米，他从第一棵树走到第九棵树，走了135步．第一棵树到第九棵树之间的距离是多长？
<gadget id="calculator">60 * 135</gadget>
<output>8_100</output>

<gadget id="calculator">8_100 / 100</gadget>
<output>81</output>

<result>81</result>